Glossary

The standard formula for body mass index in adults aged 20 and older: weight in kilograms divided by the square of height in meters, or 703 times weight in pounds divided by the square of height in inches. The resulting number is interpreted against fixed CDC and WHO cutoffs (under 18.5 underweight, 18.5 to 24.9 normal, 25.0 to 29.9 overweight, 30.0 and above obese), without any adjustment for age or sex. The figure is a rough population-level screening tool; it does not distinguish lean mass from fat mass, so it can misclassify athletes and the elderly.

A row-by-row schedule that shows every scheduled payment on a loan, the split of each payment between interest and principal, and the running outstanding balance after the payment is applied. Early rows skew toward interest because the balance is large; later rows skew toward principal as the balance shrinks. The table is the standard disclosure attached to U.S. mortgage closing documents and is the calculation backbone of any loan-payoff or refinance comparison.

A schedule that lists every scheduled payment on a loan and shows how each payment splits between interest and principal. Early rows are interest-heavy because interest is charged on the full outstanding balance; later rows are principal-heavy as the balance shrinks. The table also tracks the running balance, the cumulative interest paid, and the final payoff date.

The portion of a purchase price that a borrower pays for through credit rather than cash, equal to the loan principal after any down payment, trade-in, or rebate has been applied. It is the figure on which interest accrues and the value disclosed on Truth in Lending Act statements as the basis for the APR calculation.

A color scheme made of three or more hues that sit next to one another on the color wheel, typically within a 60-degree arc. The narrow hue spread produces low-contrast, harmonious palettes that read as a single mood, which is why analogous schemes appear often in landscape painting, brand color systems, and editorial layouts. Designers usually anchor the scheme with one dominant hue and use the neighbors as supporting tones, then add a small amount of a complementary accent when more contrast is needed.

The year-over-year percentage change in a price index, most often the Consumer Price Index for All Urban Consumers (CPI-U) in the United States or the Harmonised Index of Consumer Prices in the eurozone. A reading of 3 percent means the same basket of goods and services costs 3 percent more than it did twelve months earlier. The figure drives Social Security cost-of-living adjustments, Treasury Inflation-Protected Securities coupons, and most long-horizon retirement-projection assumptions.

Also known as: APR

The annualized cost of borrowing that includes both the nominal interest rate and mandatory fees such as origination charges and closing costs. Lenders in the United States are required by the Truth in Lending Act to disclose APR so borrowers can compare offers on equal terms. APR does not reflect compounding within the year, so the effective annual rate may differ slightly.

The percentage gain or loss on an investment over a 12-month period, expressed as a single rate that accounts for both income (dividends, interest) and capital appreciation. Multiyear performance is typically reported as a compound annual growth rate, which converts the cumulative return into an equivalent constant yearly rate for comparison across holdings and time horizons.

The fixed gross compensation an employer agrees to pay a worker over one year, before taxes, payroll deductions, and benefits contributions. It is usually divided into equal paychecks on a weekly, biweekly, semimonthly, or monthly schedule, regardless of how many hours the employee works in a given period. Bonuses, commissions, employer retirement contributions, and the imputed value of benefits sit outside the figure and form total compensation when added.

A flat ring bounded by two concentric circles of different radii. Its area equals π(R² - r²), the area of the outer disc reduced by the area of the inner disc. Washers, circular walkways, and pipe cross-sections are common annular shapes.

The adjustable opening in a camera lens that controls how much light reaches the sensor, expressed as an f-number such as f/2.8 or f/11. Smaller f-numbers correspond to wider openings, gathering more light and producing shallower depth of field.

The measure of the two-dimensional space a shape occupies, expressed in square units such as square metres or square feet. Each basic shape has its own formula: rectangles use length times width, triangles use half the base times the height, and circles use πr². Area calculations underpin problems involving flooring, land use, painting, and material estimation.

The arithmetic mean is the sum of a set of numeric values divided by their count. It is the most common form of average and is sensitive to outliers, because every value contributes equally to the total. When people say simply "average" without qualification, they almost always mean the arithmetic mean.

An 8-bit single-byte character encoding for the Armenian alphabet, defined as an Armenian national standard in 1992. The lower half maps to printable ASCII while the upper half encodes the 39 letters of the Armenian alphabet plus Armenian punctuation; it predates Unicode coverage of Armenian and now appears mostly in legacy text files.

A character-encoding standard that maps 128 code points - integers 0 through 127 - to Latin letters, Arabic numerals, punctuation marks, and control characters. Published in 1963, it became the foundation for nearly all later text encodings. UTF-8, the dominant encoding on the modern web, is backwards-compatible with ASCII for its first 128 code points.

The proportional relationship between a display's width and height, expressed as two numbers separated by a colon. 16:9 dominates televisions and most monitors. 21:9 denotes ultrawide formats. 4:3 persists in legacy content and some projectors. Custom ratios appear in professional signage and nonstandard hardware.

A graded task submitted for a course, such as an essay, problem set, lab report, or project. Each assignment carries a weight in the final grade, and the weighted sum across all assignments produces the course mark.

Installment loans used to finance a vehicle purchase, secured by the vehicle itself as collateral. Standard terms run 36 to 84 months at fixed interest rates, with rates set primarily by the borrower's credit score and the loan-to-value ratio of the financed amount against the vehicle's market value.

The amount of money in an account at a given moment, calculated by subtracting withdrawals from deposits. In lending, outstanding balance refers to the remaining principal owed on a loan after each scheduled payment. In accounting, a balance sheet lists assets, liabilities, and equity, all of which must reconcile under double-entry bookkeeping.

A macronutrient split that draws roughly equal proportions of total calories from carbohydrates, protein, and fat, typically expressed as 40 percent carbs, 30 percent protein, and 30 percent fat or close variants. The ratio sits inside the Acceptable Macronutrient Distribution Ranges set by the Institute of Medicine and is the default starting point for general-population nutrition tools. It is meant for weight maintenance and broad nutritional adequacy, not for performance- or therapeutic-driven goals, which usually call for skewed splits such as low-carb, ketogenic, or high-protein.

A rounding rule that rounds a value ending in exactly 0.5 to the nearest even integer rather than always upward. Also called round-half-to-even, it removes the upward bias of standard rounding and is the default in IEEE 754 floating-point arithmetic.

Also known as: BMR

The energy a body expends at rest to maintain essential functions such as breathing, circulation, and cell production. BMR accounts for roughly 60 to 70 percent of total daily energy expenditure for most adults. It is the baseline from which TDEE is calculated.

A double-byte character encoding for Traditional Chinese, developed in 1984 by a consortium of five Taiwanese companies and dominant on Chinese-language computers in Taiwan, Hong Kong, and Macau through the 1990s. ASCII characters use a single byte; each Chinese character uses two bytes, with the lead byte in the range 0xA1 to 0xFE. Big5 has been largely superseded by UTF-8 on the modern web but remains in legacy filenames, plain-text archives, and some government databases.

The number of bits used to encode a single sample of a signal, which sets the count of distinct values the sample can take. In digital images, bit depth is the bits per channel: 8 bits gives 256 shades per channel and roughly 16.7 million colors in 24-bit RGB, while 10 and 16 bits give the smoother gradients required for HDR video and raw photo workflows. In digital audio, 16-bit PCM is the CD standard and 24-bit PCM is the studio default, with each extra bit adding about 6 dB of dynamic range.

The number of bits used to represent a single code unit, register, color channel, audio sample, or other discrete value. It directly bounds the value range: an n-bit unsigned integer holds 0 through 2^n minus 1, so 8 bits cover 0-255, 16 bits cover 0-65535, and so on. In text encoding it determines whether a code point fits in one unit (UTF-8 bytes, UCS-2 code units) or must be split across multiple units (UTF-16 surrogate pairs).

Bits per second, the SI-derived unit of data-transfer rate, equal to one bit of information transmitted each second. The unit is the base for everyday throughput multiples such as kbit/s, Mbit/s, and Gbit/s, all built on a strict factor of 1,000. Network engineers and ISPs measure raw line capacity in bits per second; converting to bytes per second requires dividing by 8 and accounting for protocol overhead.

An equation that estimates basal metabolic rate, the number of calories a person burns at complete rest to keep basic physiological functions running. The Mifflin-St Jeor formula, the current default in clinical practice, computes 10 times weight in kilograms plus 6.25 times height in centimeters minus 5 times age in years, with a +5 offset for men and a -161 offset for women. Older alternatives include Harris-Benedict and the Katch-McArdle formula, which uses lean body mass instead of total weight.

The portion of total body mass made up of adipose tissue, typically reported as a percentage of body weight. Essential fat, needed for hormone regulation and organ cushioning, accounts for roughly 3 to 5 percent in men and 10 to 13 percent in women; storage fat accumulates above that baseline. Because BMI cannot distinguish fat from lean mass, body fat percentage is a more reliable indicator of body composition.

The share of total body mass made up of fat tissue, expressed as a percentage of total weight. Typical healthy ranges fall around 10 to 20 percent for men and 18 to 28 percent for women, with athletes often carrying less and sedentary adults more. Measurement methods include skinfold calipers, bioelectrical impedance, DEXA scans, and hydrostatic weighing, each with its own accuracy and cost profile.

A screening metric calculated by dividing a person's weight in kilograms by the square of their height in meters. The resulting number places an individual into one of several categories: underweight (below 18.5), normal (18.5–24.9), overweight (25–29.9), or obese (30 and above). BMI does not distinguish between lean mass and fat mass, so it can misclassify muscular individuals or those with atypical body composition.

The dollar value of sales a business must collect for total revenue to exactly cover total costs, leaving operating profit at zero. It equals fixed costs divided by the contribution margin ratio, where the ratio is contribution margin per unit divided by selling price per unit. The figure is the revenue counterpart of break-even units and is the more useful benchmark for businesses that sell heterogeneous products at different prices.

The quantity of product a business must sell so that total revenue exactly covers total costs and operating profit equals zero. The figure equals total fixed costs divided by the contribution margin per unit, where contribution margin is selling price minus variable cost per unit. Selling more than this number generates profit; selling less produces an operating loss.

A price reduction granted only when two or more specific items are purchased together, such as buy-one-get-one-half-off or three-for-twenty-dollars. Retailers use bundles to lift average order value, clear slower-moving inventory by pairing it with high-velocity items, and reduce per-unit fulfillment cost; the effective per-item price is lower than the standalone price but only realized at the required quantity.

The standard unit of digital information, equal to 8 bits and capable of representing 256 distinct values. A single byte can hold one ASCII character, an integer from 0 to 255, or a small fragment of a larger value such as a Unicode code point or floating-point number. File sizes, memory capacity, and network throughput are usually reported in bytes or its decimal multiples (kB, MB, GB, TB) and binary multiples (KiB, MiB, GiB, TiB).

A unit of energy commonly used to quantify the fuel value of food and the energy cost of physical activity. In nutrition, the term almost always refers to the kilocalorie (kcal), equal to 1,000 thermochemical calories. Daily calorie needs vary by age, sex, body composition, and activity level; most estimates begin with a basal metabolic rate and apply an activity multiplier.

The amount of food energy a person must consume each day to maintain current body weight, given their basal metabolic rate, activity level, and the thermic effect of food. The figure is usually estimated by computing BMR with the Mifflin-St Jeor or Harris-Benedict equation and multiplying by an activity factor between roughly 1.2 and 1.9. Eating below the estimate produces a caloric deficit and typically weight loss; eating above it produces a surplus and weight gain.

A three-dimensional shape formed by a cylinder with a hemisphere attached to each end. Its volume is the cylindrical middle plus the full sphere made up of the two hemispheres, or πr²h + (4/3)πr³. Pill-shaped tanks, pressure vessels, and capsule-shaped drug doses all share this geometry.

Carbohydrates, one of the three macronutrients alongside protein and fat, supplying 4 calories per gram. They include sugars, starches, and dietary fiber, and are the body's preferred fuel for high-intensity exercise and for the brain and red blood cells. Net carbs, the figure many low-carb diets target, are total carbs minus fiber and certain sugar alcohols that pass through digestion without raising blood glucose.

A temperature scale on which water freezes at 0 degrees and boils at 100 degrees under standard atmospheric pressure. It is the metric standard used by most of the world and by virtually all scientific work. To convert to Fahrenheit, multiply by 9/5 and add 32.

A character total that excludes whitespace such as spaces, tabs, and line breaks while still counting letters, digits, punctuation, and symbols. The figure is the standard unit for legal pleadings and academic submissions that cap document length, and it is the denominator in keyword-density calculations that ignore whitespace. It is always smaller than the total character count and tends to track roughly 80 to 85 percent of it for ordinary English prose.

A closed plane figure consisting of all points equidistant from a single centre. The distance from the centre to any point on the figure is the radius, and twice the radius is the diameter. The perimeter of a circle is its circumference, equal to 2πr, and the area enclosed is πr².

The perimeter of a circle, equal to 2πr where r is the radius, or πd where d is the diameter. It represents the total distance around the curve. We use circumference whenever a calculation depends on the length of a circular boundary, including wheels, pipes, orbits, and rotating machinery.

An obsolete IPv4 address class covering the address range 0.0.0.0 through 127.255.255.255, in which the first octet identified the network and the remaining 24 bits identified the host. A single Class A allocation could address roughly 16.8 million hosts, which is why most early Class A blocks went to large universities, defense agencies, and a few corporate pioneers. Classful addressing was deprecated by RFC 1519 in 1993 in favor of Classless Inter-Domain Routing (CIDR), but the term still appears in subnet calculators and networking textbooks.

An obsolete IPv4 address class covering the range 128.0.0.0 through 191.255.255.255, in which the first two octets identified the network and the remaining 16 bits identified the host. Each Class B network supplied roughly 65,500 host addresses, a size suited to mid-tier organizations such as regional universities and Fortune 500 corporations. Classless Inter-Domain Routing replaced classful allocation in 1993, but Class B still labels the historical 192-bit prefix range in subnet calculators and exam material.

An obsolete IPv4 address class covering the range 192.0.0.0 through 223.255.255.255, in which the first three octets identified the network and the final 8 bits identified the host. Each Class C network supplied 254 usable host addresses, a size suited to small offices and individual ISP customer assignments. Classful allocation was retired by Classless Inter-Domain Routing in 1993, but Class C remains shorthand for a /24 prefix in subnet planning, geolocation databases, and abuse-reporting tools.

The principle that certain combinations of hues produce a visually pleasing relationship when used together, derived from fixed angular positions on the color wheel. Standard schemes include complementary, analogous, triadic, tetradic, split-complementary, and monochromatic, each with predictable contrast and balance characteristics. Designers use these schemes as starting points before adjusting saturation and lightness to fit a specific composition.

The punctuation mark "," at Unicode code point U+002C, used to separate clauses, items in a list, and groups of digits in large numbers. It is the default field separator in CSV files, the namesake of the format, and a common token separator in serialized data such as JSON arrays. When a value being separated already contains a comma, parsers rely on quoting or escape conventions to keep the boundary unambiguous.

In colour theory, a pair of hues positioned directly opposite each other on the colour wheel, such as red and green or blue and orange. Placing two complementary colours side by side produces strong visual contrast, while mixing them in pigment tends toward a neutral grey or brown. Complementary pairs are a common starting point for accent colours and visual emphasis.

A colour scheme that extends a base hue with the two colours adjacent to its complement, producing a softer alternative to a direct complementary pairing. Also known as a split-complementary scheme, it gives designers contrast without the tension of exact opposites. Three-colour palettes built this way are widely used in branding and illustration.

The number of times per year that interest is calculated and added to the principal of a deposit or loan. Common values are annual, semiannual, quarterly, monthly, daily, and continuous. At a fixed nominal rate, a higher compound frequency produces a larger effective annual yield, since each new interest amount itself earns interest over the rest of the year.

The interval at which interest accrued on a balance is added back to the principal, so subsequent interest is calculated on the larger sum. Common periods are annual, semiannual, quarterly, monthly, and daily; shorter periods produce a higher effective annual yield because compounding occurs more often per year.

The number of compounding periods per year used to convert a stated nominal interest rate into the rate actually applied to a balance. Doubling the frequency, for example from semiannual to quarterly, leaves the nominal rate unchanged but raises the effective annual rate, since each interest credit begins earning interest sooner. Continuous compounding is the limiting case as the frequency tends to infinity.

To calculate grade point average by multiplying each course's grade points by its credit weight, summing those products, and dividing by total credits attempted. The result is reported on the institution's scale, most often 4.0 in the United States.

The date on which a sperm cell fertilizes an egg, marking the start of pregnancy in biological terms. For naturally conceived pregnancies the date is rarely known precisely and is estimated as roughly 14 days after the first day of the last menstrual period in a typical 28-day cycle. With assisted reproduction, conception is dated from the IVF retrieval or insemination procedure, which is why ART pregnancies usually have a more accurate due-date estimate than naturally conceived ones.

A three-dimensional solid with a circular base and a single apex, its lateral surface tapering smoothly from the edge of the base to that point. The volume of a right circular cone is one-third πr²h, exactly one-third of the cylinder that shares its base and height. Traffic cones, ice-cream cones, and funnels all trace the same geometric form.

A tool that compares the relative luminance of a foreground color against a background and reports the contrast ratio. The ratio is graded against the WCAG thresholds of 4.5:1 for normal body text and 3:1 for large text or non-text components.

A numeric measure of luminance difference between two colors, expressed as the ratio of the lighter relative luminance plus 0.05 to the darker plus 0.05. The scale runs from 1:1 for identical colors to 21:1 for pure black on pure white. WCAG 2 sets accessibility minimums of 4.5:1 for normal body text and 3:1 for large text and meaningful graphics, with stricter AAA thresholds at 7:1 and 4.5:1.

How often a saver adds money to an investment or retirement account, typically weekly, biweekly, monthly, quarterly, or annually. A higher contribution frequency at the same total annual amount produces a slightly larger ending balance because each deposit begins compounding sooner, an effect known as dollar-cost averaging when the underlying asset price varies. Most workplace plans peg contribution frequency to pay frequency so deductions occur each pay period.

Also known as: CM

The amount that each additional unit sold contributes toward fixed costs and operating profit, computed as selling price per unit minus variable cost per unit. It measures the profitability of one more sale before any fixed overhead is allocated, so it isolates the marginal economics of expanding volume. The figure is the denominator in the standard break-even formula and the basis of any contribution-margin income statement.

The average production cost attributed to a single unit of output, equal to total costs divided by units produced. The figure can be drawn from direct variable costs alone, or from full absorbed cost that also spreads fixed overhead across the volume produced. Producers compare it with revenue per unit to gauge gross margin and use it as a floor for pricing decisions.

A scheduled program of instruction in a single subject, organized around a syllabus, assignments, and an instructor of record. Courses carry a credit value, a grade, and a term in which they are taken.

A numerical summary of a borrower's creditworthiness, typically ranging from 300 to 850 in the FICO model. Lenders use it to estimate the probability of default when deciding whether to extend credit and at what interest rate. The score is derived from payment history, amounts owed, length of credit history, credit mix, and recent inquiries.

Units of academic measurement assigned to a course, typically reflecting weekly contact hours or expected workload. Degrees specify a minimum total of credits to graduate, and credit values weight each course's contribution to the grade point average.

A stylesheet language that controls the visual presentation of HTML documents - layout, colour, typography, spacing, and animation. Rules consist of selectors that target elements and declarations that set property values. The cascade and specificity algorithms determine which rule wins when multiple declarations compete for the same property on the same element.

A three-dimensional solid with six square faces, twelve equal edges, and eight vertices meeting at right angles. Its volume is the edge length raised to the third power; its surface area is six times the edge length squared. Dice, sugar cubes, and shipping containers rely on the shape because it tiles space with no wasted gaps.

A grade-point average computed across every course a student has completed at the institution, rather than a single term. The figure equals total quality points earned divided by total credit hours attempted, where each course contributes its grade-point value multiplied by its credit weight. It is the standard measure on a U.S. transcript, the figure college admissions officers and employers look at, and the basis for academic-honors and probation thresholds.

The grade point average computed from all coursework a student has completed up to the present moment. It reflects cumulative academic performance to date and serves as the starting point for projections about future term GPAs needed to reach a target.

The number of calories the body burns over 24 hours at complete rest to maintain basic functions: breathing, circulation, cell production, and core temperature. It accounts for roughly 60 to 75 percent of total daily energy expenditure and serves as the baseline before activity multipliers are applied to estimate maintenance calories.

A specific day on the calendar, typically identified by year, month, and day of month. Most digital systems store dates in ISO 8601 format (YYYY-MM-DD) because the sort order of the string matches the chronological order of the date. Calculations involving dates must account for varying month lengths, leap years, and time zones, all of which complicate the arithmetic.

A technique that suppresses repeated firings of an event handler until a quiet period of a specified duration has elapsed, then runs the handler once with the most recent input. It is the standard way to limit work on rapidly fired events such as keystrokes in a search box, window resizes, and scroll position updates, where only the final value matters. Debouncing differs from throttling, which guarantees the handler runs at a fixed maximum rate during a burst rather than waiting for the burst to end.

A base-10 numeral system that uses the ten digits 0 through 9 and a fractional point to represent values smaller than one. Digits left of the point stand for whole units, tens, hundreds, and so on; digits right of the point stand for tenths, hundredths, and thousandths. Decimal is the default system for everyday arithmetic, currency, and most scientific measurement.

To reverse URL encoding by converting percent-escape sequences such as %20 back into the characters they represent. Decoding is the counterpart to encoding and is required when a server or client extracts a value from a query string or path segment.

A character or short sequence that marks the boundary between fields, records, or tokens in a stream of text. Common single-character delimiters include the comma in CSV files, the tab in TSV files, the semicolon in many European exports, and the pipe in flat-file dumps from databases. When a delimiter character also appears inside data, the format relies on quoting, escaping, or a multi-character delimiter to keep the parse unambiguous.

The ratio of physical pixels on a display to CSS pixels, exposed to web pages through window.devicePixelRatio. A value of 1 marks a standard-density display; modern Retina, OLED phones, and 4K laptops report values of 2, 3, or fractional figures such as 1.5 or 1.75 on Windows scaling. Image and canvas code multiplies layout sizes by the ratio to render at the panel's native resolution, which is the standard remedy for blurry images and thin lines on high-DPI screens.

The straight-line distance from one corner of a rectangle to the opposite corner, equal to the square root of the sum of the squares of the two sides. Display manufacturers quote screen size as the diagonal length in inches, so a 27-inch monitor is 27 inches from one corner to the diagonal opposite, regardless of aspect ratio. Combined with the aspect ratio, the diagonal determines the underlying width and height of the panel; a 27-inch 16:9 screen, for instance, is roughly 23.5 inches wide and 13.2 inches tall.

An upfront cash payment made at the time of purchase, expressed as a fixed amount or percentage of the total price. It reduces the principal balance of the resulting loan and, for mortgages, determines whether private mortgage insurance is required. A down payment below 20% of a home price typically triggers PMI, adding to the monthly cost.

The dollar value taken out of a tax-advantaged retirement account before the participant reaches age 59 1/2. The IRS treats the distribution as ordinary income and applies a 10% additional penalty unless an exception applies, such as permanent disability, qualified medical expenses, first-time home purchases up to $10,000, or substantially equal periodic payments under Rule 72(t).

Ingredients used in place of whole eggs in baking and cooking, chosen to replicate one of the egg's roles: binding, leavening, moisture, or structure. Common options include flax or chia seeds soaked in water, mashed banana, applesauce, silken tofu, aquafaba, and commercial powdered replacers; no single substitute reproduces all of an egg's functions, so the best choice depends on which role the recipe requires.

A three-dimensional surface whose cross-sections in every direction are ellipses, defined by three semi-axes along perpendicular directions. Its volume equals (4/3)π multiplied by the product of the three semi-axis lengths, and it reduces to a sphere when all three semi-axes are equal. Planets, which bulge at the equator and flatten at the poles, are approximated as oblate spheroids, a specific type of ellipsoid.

The number of days an embryo has been cultured in the lab before being transferred into the uterus during in vitro fertilization, most often day 3 (cleavage stage) or day 5 (blastocyst stage). The transfer date and the day-of-transfer figure together fix the pregnancy due date precisely, since the developmental age of the embryo is known. Day-5 blastocyst transfers carry higher per-transfer pregnancy rates than day-3 cleavage transfers and are the current default in most U.S. fertility clinics.

The portion of a worker's gross pay that is deferred into a workplace retirement plan such as a 401(k) or 403(b), typically expressed as a percentage of salary. Pretax contributions reduce current taxable income while Roth contributions do not; both grow tax-deferred and are subject to the IRS annual elective deferral limit, with separate catch-up limits for participants age 50 and older.

A contribution an employer makes to an employee retirement account, typically expressed as a percentage of the employee's own contribution up to a cap. A common structure is 50% of contributions up to 6% of salary, effectively adding 3% of salary when the employee contributes at least 6%. Failing to contribute enough to capture the full match is forfeited compensation.

The fraction of an employee's own retirement-plan contribution that the employer adds on top, commonly expressed as a per-dollar rate (such as 50% match) up to a percentage-of-salary cap (such as 6%). A 50% match capped at 6% means the employer contributes 3% of salary when the employee defers at least 6%; matched amounts vest on the schedule defined in the plan document.

A function or device that transforms data from one representation into another, such as text into Base64 or audio into MP3. The reverse operation is performed by a decoder, and lossy encoders discard information that the decoder cannot recover exactly.

The process of mapping characters, numbers, or other data onto a defined sequence of bytes for storage or transmission. Common text encodings include ASCII, UTF-8, UTF-16, and Base64. The reverse operation, decoding, recovers the original data from those bytes using the same scheme; mismatched encodings between writer and reader produce mojibake or outright errors.

Bread dough fortified with fat, sugar, eggs, milk, or a combination of these beyond the lean baseline of flour, water, salt, and yeast. Enrichment slows yeast activity, tenderizes the crumb, deepens browning through additional Maillard reactions, and yields softer products such as brioche, challah, and milk bread.

Extended Unix Code for Simplified Chinese, an 8-bit variable-width encoding that combines ASCII with the GB 2312 character set covering roughly 6,700 simplified Han characters and Chinese punctuation. ASCII bytes use the lower half of the byte range; pairs of bytes both in the high range encode GB 2312 characters. EUC-CN is the on-disk form behind the GB2312 label commonly seen in HTML charset declarations and has been largely superseded by GBK, GB 18030, and UTF-8 on the modern web.

Extended Unix Code for Japanese, a variable-width character encoding that combines ASCII with the JIS X 0208 and JIS X 0212 character sets to support hiragana, katakana, and kanji. Single bytes carry ASCII; two-byte sequences with both bytes in the high-bit range encode JIS X 0208; three-byte sequences prefixed by 0x8F encode the supplementary JIS X 0212 plane. EUC-JP was the dominant encoding for Japanese on Unix and the early web before UTF-8 took over.

Extended Unix Code for Korean, an 8-bit variable-width encoding that combines ASCII with the KS X 1001 character set covering Hangul syllables, Hanja, and Korean punctuation. ASCII bytes use the lower half of the byte range; two-byte sequences with both bytes in the high range encode KS X 1001 characters, giving room for 2,350 precomposed Hangul syllables. EUC-KR was the standard Korean encoding on Unix systems and remained common on Korean web pages into the 2000s before UTF-8 became dominant.

Extended Unix Code for Traditional Chinese as used in Taiwan, a variable-width encoding built around the CNS 11643 standard. Single bytes encode ASCII; two-byte sequences encode the first plane of CNS 11643, and four-byte sequences with a 0x8E lead byte and a plane indicator reach the remaining 16 supplementary planes. The encoding is rare outside academic and government text and has been largely displaced by Big5 in everyday Taiwanese computing and by UTF-8 on the web.

The ISO 4217 currency code for the euro, the single currency of the eurozone and the second-most-held reserve currency in the world. Introduced as accounting money in 1999 and as physical notes and coins in 2002, the euro is currently the official currency of 20 European Union member states plus several non-EU territories that have adopted it under formal monetary agreements. Monetary policy for the euro is set by the European Central Bank in Frankfurt.

The price at which one currency converts into another, quoted as a ratio such as 1 USD = 0.92 EUR. Rates float in response to interest differentials, trade flows, and central-bank policy, and they diverge across interbank, retail, and tourist tiers.

A camera setting that biases the meter's chosen exposure by a fixed number of stops, written as values such as +1 EV or -2/3 EV. Photographers apply it to correct for scenes the meter misreads, such as snow rendering as gray or backlit subjects falling into silhouette.

Optional work that can raise a course grade beyond what regular assignments would yield. Instructors set the cap, often a few percentage points, and decide whether the points apply before or after final-grade rounding.

A temperature scale in which water freezes at 32 degrees and boils at 212 degrees under standard atmospheric pressure. It is used primarily in the United States for weather, cooking, and medical contexts. To convert to Celsius, subtract 32 and multiply by 5/9.

The share of total daily calories that comes from dietary fat, expressed as a percentage. Fat supplies 9 calories per gram, more than twice the energy density of protein or carbohydrates, so a small mass of fat contributes a large slice of the calorie total. The Acceptable Macronutrient Distribution Range from the Institute of Medicine recommends 20 to 35 percent of calories from fat for adults; ketogenic diets push this share well above 60 percent.

A tax levied by the United States federal government on the annual income of individuals, corporations, estates, and trusts, administered by the Internal Revenue Service. Individual liability is computed by applying graduated marginal rates to taxable income after the standard or itemized deduction and any allowed credits. Employers withhold the tax from each paycheck and remit it to the Treasury; final reconciliation occurs on Form 1040.

The percentage rate at which the U.S. federal government taxes a slice of taxable income, set in graduated brackets that currently run from 10 to 37 percent for individuals. Each bracket applies only to the income that falls within its range, not to total income, which is why the marginal rate exceeds the effective rate for most filers. Brackets, the standard deduction, and credit thresholds are indexed annually for inflation by the Internal Revenue Service.

A unit of length equal to one quadrillionth of a meter (10^-15 m), originally named for the Italian-American physicist Enrico Fermi and now a synonym for the SI unit femtometer. The fermi is the working scale for nuclear physics: the radius of a proton is about 0.84 fermi, and a typical atomic nucleus spans a few fermi across. The unit appears more often in older textbooks and in particle-physics literature than in modern engineering work, where femtometer is preferred.

The amount of storage a file occupies, measured in bytes and reported in multiples such as kilobytes, megabytes, or gigabytes. One kilobyte commonly equals 1,024 bytes in software conventions but 1,000 bytes in storage vendor marketing, which is why a 500 GB drive shows roughly 465 GB available. Larger file sizes extend transfer time, consume more bandwidth, and take up more disk space.

The target letter grade or percentage a student aims to earn in a course by the end of the term. Given the current weighted score, the required performance on remaining assignments is the value that lifts the weighted average to the goal.

Patterns of friction ridges on the skin of a fingertip, unique to each individual and stable through life. In computing, the term also describes a short identifier derived from a larger key or file, such as an SSH key fingerprint or a browser fingerprint, used for verification or tracking.

Business expenses that do not vary with the volume of goods or services produced over a given period. Common examples include rent, salaried payroll, insurance premiums, equipment leases, and depreciation on long-lived assets. Fixed costs sit opposite variable costs in a cost-volume-profit model and are the figure recovered before any contribution margin turns into operating profit.

The distance, in millimeters, between a lens's optical center and the sensor when focused at infinity. It determines angle of view and apparent magnification, with short focal lengths producing wide angles and long focal lengths producing telephoto framing.

The first half of the menstrual cycle, beginning on the first day of menses and ending at ovulation, during which follicle-stimulating hormone drives a cohort of ovarian follicles toward maturity. One follicle becomes dominant and produces rising estrogen, which thickens the uterine lining and triggers the luteinizing-hormone surge that releases the egg. The phase is typically 10 to 16 days long; variation in its length is the main reason cycles are not all 28 days, while the luteal phase that follows is more uniform.

The size of a typeface character, most often measured in pixels, points, or em units on the web. Browsers default body text to 16 pixels, and accessibility guidelines recommend at least that size for readable body copy. Relative units such as em and rem scale font size against a base value, which lets users override the default without breaking the layout.

A way of expressing a part of a whole as a numerator over a denominator, such as 3/4 for three parts out of four. Proper fractions have numerators smaller than their denominators; improper fractions do not, and can be rewritten as a mixed number. Any fraction converts to an equivalent decimal by dividing the numerator by the denominator.

The rate at which a repeating event occurs, measured in cycles per second and expressed in hertz (Hz). In signal processing, one hertz equals one cycle per second; the audible range for humans runs from roughly 20 Hz to 20,000 Hz. In statistics, frequency instead refers to the count of how often each value appears in a data set.

A consumer marketing label for the 1920 by 1080 pixel display resolution, also known as 1080p when delivered at progressive scan. The format carries a 16:9 aspect ratio and roughly 2.07 million pixels, and it became the dominant standard for HDTV broadcasts, Blu-ray discs, and laptop panels through the 2010s. It sits one tier above 720p HD Ready and one tier below 4K Ultra HD, with the same horizontal pixel count as the cinema-oriented 2K format.

A unit of length equal to 660 feet, 220 yards, or one eighth of a mile, fixed in modern terms at exactly 201.168 meters. It originated in medieval England as the length of a furrow plowed in a typical open-field strip and survives today mainly in horse racing, where race distances and finishing margins are quoted in furlongs. The unit has no role in scientific or engineering work but appears regularly in unit-conversion tools because of legacy use cases and curiosity.

Gigabyte, a unit of digital information equal to 1,000,000,000 bytes under the SI decimal definition or 1,073,741,824 bytes (2^30) under the binary definition written as GiB. The mismatch is the reason a 1 TB drive labeled by the manufacturer reports as roughly 931 GiB once formatted. Gigabytes are the everyday unit for full-length movies, modern game installs, and consumer-grade RAM modules.

Gigabytes per second, a unit of throughput equal to 1,000,000,000 bytes each second under the SI decimal definition. The unit is the working scale for NVMe SSDs, PCIe and DDR memory buses, and modern data-center backplanes; PCIe Gen 5 x16 reaches roughly 63 GB/s of usable throughput. Converting GB/s to Gbit/s requires multiplying by 8, so a 7 GB/s SSD corresponds to about 56 Gbit/s of raw bus traffic.

Gigabits per second, a unit of data-transfer rate equal to 1,000,000,000 bits each second. The unit is the standard rating for modern Ethernet (1 Gbit/s, 10 Gbit/s, 100 Gbit/s), data-center backbone links, and consumer fiber broadband. A 1 Gbit/s connection delivers a theoretical 125 MB/s of throughput before subtracting framing, header, and protocol overhead.

The ISO 4217 currency code for the pound sterling, the official currency of the United Kingdom, the Crown Dependencies, and several British Overseas Territories. The pound is subdivided into 100 pence and is one of the world's oldest currencies still in use, with continuous issuance traceable to the 8th century. Monetary policy is set by the Bank of England, and GBP is among the most actively traded currencies in the global foreign-exchange market.

The geometric mean is the nth root of the product of n positive values. It is preferred for averaging rates, ratios, and multiplicative growth figures, because it reflects compounding in a way the arithmetic mean cannot. Over any positive dataset, the geometric mean is always less than or equal to the arithmetic mean.

The elapsed time since the first day of the last menstrual period, measured in weeks and days. It is the standard clinical metric for tracking pregnancy progression and estimating a due date. Gestational age typically exceeds fetal age by about two weeks because the count begins before conception occurs.

The number of weeks since the first day of the pregnant person's last menstrual period, the standard clinical measure of how far along a pregnancy is. Counting from LMP rather than from conception adds about two weeks to the actual age of the embryo or fetus, but it is the convention adopted by ACOG, WHO, and most prenatal-care guidelines. A typical pregnancy lasts 40 weeks of gestational age, with term defined as 37 to 42 weeks and any earlier delivery classified as preterm.

Free of gluten, the elastic protein network formed when wheat, barley, rye, and their hybrids are hydrated. The label is a medical necessity for people with celiac disease, non-celiac gluten sensitivity, or wheat allergy. In the United States, the FDA permits the gluten-free claim only when total gluten content stays below 20 parts per million.

A mark assigned to a piece of academic work or an entire course, indicating performance against a defined standard. Common scales are letter grades from A to F, four-point grade points, and percentage scores from 0 to 100.

The numeric value assigned to a letter grade in a single course, used as the building block for grade-point average. On the standard U.S. four-point scale, A is 4.0, B is 3.0, C is 2.0, D is 1.0, and F is 0; the figure is multiplied by the course's credit hours to produce quality points before averaging.

The mapping from numerical scores or grade points to letter grades or pass-fail categories. A standard scale might assign 90 to 100 as A and 80 to 89 as B, though institutions vary on plus-minus boundaries and the F threshold.

Total earnings before any deductions for taxes, retirement contributions, or other withholdings. For individuals it includes wages, tips, dividends, interest, capital gains, and rental income; for businesses it equals revenue minus the cost of goods sold.

The difference between revenue and cost of goods sold, expressed as a currency amount or as a percentage of revenue. It measures how much of each unit of revenue remains after covering direct production costs. Gross margin does not account for operating expenses, taxes, or interest, so it is not a measure of overall profitability.

The harmonic mean is the count of values divided by the sum of their reciprocals. It gives the correct average for rates measured over equal units, such as speeds across equal distances or prices across equal quantities. For any positive dataset, the harmonic mean is the smallest of the three common means, below both the geometric and arithmetic means.

Half of a sphere, produced by cutting a sphere with a plane that passes through its centre. Its volume is (2/3)πr³, exactly half the volume of the complete sphere, and its curved surface area is 2πr². Domes, bowl-shaped tanks, and the upper or lower halves of the Earth are common hemispherical forms.

A dietary pattern that draws a larger-than-typical share of total calories from protein, often 30 to 40 percent, with proportional reductions in carbohydrate or fat. The pattern is favored by athletes building muscle, by people in a calorie deficit aiming to preserve lean mass, and by anyone seeking the satiety advantage of protein over the other macronutrients. Sustained intakes up to 1.6 to 2.2 grams of protein per kilogram of body weight per day are well tolerated by adults with normal kidney function.

A macronutrient breakdown that emphasizes protein, typically setting it at 30 to 40 percent of daily calories or roughly 1.6 to 2.2 grams per kilogram of body weight, with carbohydrates and fat filling the remainder. The pattern is used to support muscle synthesis during resistance training, to preserve lean mass during caloric deficits, and to increase satiety on cuts.

Recurring fees paid by owners in a planned community, condominium, or townhouse complex to a homeowners association that maintains shared property and enforces community rules. The dues fund landscaping of common areas, exterior maintenance, amenities such as pools and clubhouses, master insurance, and reserves for future capital repairs. They are billed monthly, quarterly, or annually, and unpaid amounts can attach as a lien on the home.

A colour model that represents a colour by three values: hue in degrees around a colour wheel (0 to 360), saturation as a percentage (0 to 100), and lightness as a percentage (0 to 100). HSL maps more intuitively to human perception than RGB, because adjusting lightness alone brightens or darkens the same hue without shifting it. CSS supports HSL directly, as in hsl(210, 80%, 50%) for a medium blue.

The standard markup language for documents displayed in web browsers. Elements are expressed as angle-bracket tags - headings, paragraphs, links, images, forms - that define the structure and semantics of a page. Browsers parse the markup into a document object model (DOM), which CSS styles and JavaScript can then manipulate.

The Hypertext Transfer Protocol, a client-server protocol that governs how browsers and APIs request and receive resources on the web. A client sends a request consisting of a method (GET, POST, PUT, DELETE), a URL, headers, and an optional body; the server returns a numeric status code, headers, and a response body. HTTPS is the same protocol wrapped in TLS encryption and is now the standard for all public web traffic.

An authentication scheme defined in RFC 7617 that sends a username and password joined by a colon, base64-encoded, in the HTTP Authorization header. Because base64 is a reversible encoding rather than encryption, the credentials are effectively cleartext on the wire; the scheme is safe to use only over TLS and is generally reserved for low-value endpoints, internal services, or as a fallback alongside stronger token-based methods.

An approximate mapping of an animal's biological age to the corresponding stage in a human lifespan, used to communicate a pet's maturity and health expectations in familiar terms. The once-popular rule of multiplying a dog's age by seven is inaccurate; modern formulas account for breed size, since large breeds age faster than small ones. The conversion is a rough heuristic, not a clinical measure.

Higher Level, the more demanding of the two course tiers in the International Baccalaureate Diploma Programme. HL courses cover 240 teaching hours over two years, compared to 150 hours for Standard Level, and Diploma candidates must take at least three subjects at HL.

The mark a student earns in an International Baccalaureate Diploma course, reported on a 1 to 7 scale, where 7 is the highest. The Diploma adds the six subject scores together (maximum 42) and tacks on up to 3 bonus points for the Theory of Knowledge essay and Extended Essay, for a maximum total of 45. A score of 24 with no failed components is the minimum required for the Diploma; U.S. universities typically translate IB scores of 5, 6, and 7 into A-equivalent grades for GPA purposes.

A sustained increase in the general price level of goods and services over time, measured as an annual percentage change. Central banks typically target an inflation rate near 2 percent, treating modest price growth as compatible with economic stability. When inflation outpaces wage growth, purchasing power erodes - the same currency buys less than it did in prior periods.

The percentage rate at which the general price level of goods and services rises over a specified period, eroding the purchasing power of money. The figure is most commonly reported as the year-over-year change in a consumer price index, with monthly readings annualized for headline coverage. Central banks target a low, stable rate (the U.S. Federal Reserve and European Central Bank both aim for 2 percent) and adjust short-term interest rates when actual inflation drifts away from the target.

A single component used in a recipe, listed with the quantity required for a given yield. Scaling a recipe multiplies every ingredient by the same factor, under the assumption that all ingredients scale linearly. Leaveners, salt, and spices do not always scale proportionally beyond certain thresholds, which is why large batches often need separate adjustment.

The diameter measured across the inside of a hollow cylindrical object, from interior wall to interior wall through the center. It is the relevant dimension when fitting something inside the object, such as a pipe's flow capacity, a ring's finger size, or a bearing's shaft. The abbreviation ID distinguishes it from outer diameter (OD) on engineering drawings.

A dried strain of Saccharomyces cerevisiae milled into smaller particles than active dry yeast and packaged with no need for proofing in warm water before use. It can be added directly to flour, ferments faster than active dry yeast, and is the form most commercial bakeries rely on for predictable proof times.

A whole number with no fractional part, which may be positive, negative, or zero. Integers form the set of values ..., -2, -1, 0, 1, 2, ..., often denoted by the mathematical symbol Z. In programming, integer types occupy a fixed number of bits, which gives each type a minimum and maximum representable value.

A fee paid by a borrower to a lender for the use of borrowed money, or the income paid to an investor for the use of their capital. Simple interest is calculated on the original principal alone; compound interest is calculated on principal plus any interest previously accumulated. The rate is normally quoted as an annual percentage, then applied over the loan or investment term.

The total amount paid to the holder of a deposit, bond, or other interest-bearing instrument over a stated period. For a simple-interest account it equals principal multiplied by rate and time; for a compounding account it equals the ending balance minus the principal and any contributions. U.S. banks report the figure annually on Form 1099-INT, and it is generally taxable as ordinary income.

The percentage a lender charges on the outstanding principal of a loan, or the return earned on a deposit or investment. It is typically expressed as an annual figure and applied on a monthly or daily compounding basis to determine periodic payments. Nominal rates do not account for fees or compounding frequency, so the effective annual rate or APR often provides a more accurate cost comparison.

Also known as: IRR

The discount rate at which the net present value of an investment's cash flows equals zero, expressed as an annualized percentage. It is the metric finance teams use to rank projects on a like-for-like basis: any IRR above the firm's cost of capital signals that the project creates value.

A two-year secondary education program leading to the IB Diploma, recognized for university admission worldwide. Students take six subjects across language, sciences, mathematics, and the arts, plus a core of theory of knowledge, the extended essay, and creativity, activity, service.

The gain or loss on an investment over a stated period, expressed as a percentage of the amount invested. Returns may be quoted as nominal, real (inflation-adjusted), pre-tax, or after-tax, and annualized to allow comparison across holding periods.

A numeric label assigned to each device on a computer network that uses the Internet Protocol for communication. IPv4 addresses are 32-bit values written as four dot-separated octets; IPv6 addresses use 128 bits to accommodate a far larger address space. Routers use these addresses to forward packets between networks.

International Standard Book Number, a 13-digit identifier assigned to each edition of a published book. The leading digits encode registration group, publisher, and title, and the final digit is a checksum. ISBNs were 10 digits before 2007 and still circulate in legacy catalogs.

A programming language that runs in web browsers and enables interactive behavior on web pages, including form validation, dynamic content updates, and tool calculations. All Kaltask tools execute their logic in client-side JavaScript within a sandboxed iframe. No data leaves the browser unless the user explicitly shares a result.

A formula for estimating basal metabolic rate that uses lean body mass rather than total weight, making it more accurate for individuals who know their body fat percentage. The equation is BMR = 370 + (21.6 × lean mass in kg). It produces a single result regardless of sex, unlike the Mifflin-St Jeor or Harris-Benedict formulas.

Kilobyte, a unit of digital information that equals 1,000 bytes under the SI decimal definition used by storage manufacturers and network engineers, or 1,024 bytes under the binary definition still common in operating systems and RAM specifications. The IEC introduced the symbol KiB in 1998 to make the binary value unambiguous, but the older KB notation persists in everyday use. Context usually makes the intended factor clear: disk and bandwidth specs are decimal, file managers and memory tools are typically binary.

Kilobytes per second, a unit of throughput equal to 1,000 bytes (or 1,024 bytes under the binary convention) transferred each second. The unit is the natural read-out for download managers, file copies, and disk benchmarks because file sizes are measured in bytes. Converting from a network plan in Mbit/s to KB/s requires dividing by 8 to reach megabytes per second and multiplying by 1,000 to reach kilobytes per second.

Kilobits per second, a unit of data-transfer rate equal to 1,000 bits each second. The unit is most often seen on audio bitrates (MP3 at 128 kbit/s, AAC at 256 kbit/s), low-bandwidth video streams, and legacy modem and ISDN connections. Converting kbit/s to kilobytes per second requires dividing by 8, so a 256 kbit/s stream consumes about 32 KB/s of bandwidth.

The words and phrases a piece of content is optimized to match in search-engine queries, paid-search auctions, or internal site search. In SEO they are inferred from on-page language, headings, internal links, and structured data rather than declared in a meta tag, since major engines have ignored the legacy meta keywords field for over a decade. In paid search they are explicit bid units, with match types (exact, phrase, broad) controlling how loosely a query can match the keyword and still trigger an ad.

An 8-bit character encoding for Russian Cyrillic, defined in RFC 1489 and dominant on Soviet and post-Soviet Unix systems and email clients through the 1990s. The lower half is ASCII; the upper half places Cyrillic letters in an order that, when the high bit is stripped by 7-bit-clean systems, leaves a phonetic Latin transliteration that remains readable. It has been largely displaced by UTF-8 and Windows-1251 on the modern web but persists in legacy mail archives.

An 8-bit character encoding for Ukrainian Cyrillic, defined in RFC 2319 as a superset of KOI8-R. The lower half is ASCII; the upper half preserves the KOI8-R Russian letter layout but reassigns four positions in the box-drawing range to the Ukrainian-specific letters Ge with upturn, Ie, I, and Yi in upper and lower case. Like KOI8-R it has been largely displaced by UTF-8 and Windows-1251 on modern systems but remains in legacy mail and Usenet archives.

Bread made from flour, water, salt, and yeast with little or no added fat, sugar, eggs, or dairy. Baguettes, ciabatta, and rustic sourdoughs are typical examples; the absence of enrichment produces an open crumb, crisp crust, and pronounced wheat flavor.

A symbolic mark assigned to a student's performance on a course or assignment, drawn from the A-through-F scale used in most U.S. schools. Each letter maps to a percentage range and a grade-point value, typically A = 90-100% = 4.0, B = 80-89% = 3.0, and so on, with plus and minus modifiers shifting values by roughly 0.3.

The uniform horizontal space added between adjacent characters in a run of text, also known as tracking in typography. Positive values push letters apart for emphasis or all-caps headings; negative values pull them together to tighten display type. Letter spacing differs from kerning, which adjusts the gap between specific character pairs rather than applying a uniform change across the run.

The average number of additional years a person of a given age and demographic profile is statistically expected to live, derived from population mortality tables. Retirement and insurance models treat it as a planning horizon: drawdown calculators use it to size sustainable withdrawal rates, and annuity issuers use it to price guaranteed lifetime income.

The vertical distance between the baselines of consecutive lines of text, controlling how much space each line occupies. A line height of 1.5 means every line takes 150 percent of the font size; values below 1.2 usually appear cramped, while values above 1.8 feel loose. Body copy is most readable between 1.4 and 1.6 for standard sans-serif fonts.

A standard way of estimating a pregnancy due date, named for the last menstrual period. Naegele's rule applies the method by adding one year to the first day of the last period, subtracting three months, and adding seven days, which targets a 280-day pregnancy. The estimate assumes a regular 28-day cycle with ovulation on day 14, so clinicians adjust for shorter or longer cycles or replace the LMP date with an early ultrasound measurement when the dates are uncertain.

The principal sum borrowed from a lender, before interest or fees accrue. In a mortgage context, it equals the purchase price minus the down payment. The loan amount, together with the interest rate and term, determines the periodic payment schedule.

Filler text used by typesetters and designers as a stand-in for real copy when laying out a document, beginning with the phrase "Lorem ipsum dolor sit amet." The passage is a scrambled excerpt from Cicero's "De Finibus Bonorum et Malorum," written in 45 BCE and adapted into placeholder form by an unknown printer in the 16th century. Its uneven word lengths and Latinate letter distribution approximate Western typography without forming readable English, which keeps reviewers focused on layout rather than content.

A dietary pattern that limits carbohydrate intake well below typical Western levels, often to 50 to 130 grams per day, with the calorie shortfall replaced by protein and fat. The reduced carbohydrate load lowers insulin secretion and is the basis of the Atkins, South Beach, and Banting programs. The ketogenic diet is the strict end of the spectrum, capping carbs near 20 to 50 grams per day to push the liver into producing ketone bodies as the primary fuel.

A macronutrient breakdown that reduces carbohydrates well below standard guidance, typically to 10 to 30 percent of daily calories, and shifts the remainder toward protein and fat. Protein commonly lands at 25 to 35 percent and fat at 40 to 60 percent. The pattern is used for blood-sugar management, ketogenic adaptation, and weight loss protocols that leverage reduced insulin signaling.

A dietary pattern that draws a smaller-than-typical share of total calories from fat, usually 20 percent or less, with the difference made up by carbohydrate and protein. The pattern was the dominant U.S. clinical recommendation from the late 1970s through the 1990s and underpinned the Ornish and Pritikin programs. Modern nutrition guidance treats the share of total fat as less important than the type, with saturated and trans fats limited and unsaturated fats encouraged.

A single, one-time investment of money made up front, in contrast to a series of periodic contributions such as a Systematic Investment Plan. With a positive expected return, a lump sum tends to outperform an equal total split into installments because the full balance starts compounding immediately. The trade-off is timing risk: the entire investment is exposed to whatever the market does next, which is why investors with cash to deploy often weigh lump-sum investing against dollar-cost averaging.

The second half of the menstrual cycle, beginning at ovulation and ending with the start of the next period, during which the ruptured follicle becomes the corpus luteum and secretes progesterone. Progesterone holds the uterine lining in place to support a possible implantation; if no implantation occurs, the corpus luteum regresses and the lining sheds as menstruation. The phase is consistently about 12 to 14 days; a phase shorter than 10 days, called a luteal-phase defect, is associated with reduced fertility.

The daily calorie intake at which a person neither gains nor loses weight, equal to total daily energy expenditure for that individual. The figure depends on basal metabolic rate, the thermic effect of food, and energy spent on planned exercise and on non-exercise activity such as walking and fidgeting. Sustained intake above maintenance produces weight gain; intake below it produces weight loss, with each pound of body fat corresponding to roughly 3,500 stored calories.

The difference between selling price and cost, expressed as a percentage of selling price. On a 20 dollar item that cost 12 dollars, the margin is 8 divided by 20, or 40 percent. Gross margin covers direct costs only; operating margin, net margin, and profit margin each subtract progressively more expenses from the same revenue figure.

Profit on a sale expressed as a percentage of the selling price, computed as revenue minus cost divided by revenue. On a 20 dollar item that cost 12 dollars, the margin percentage is 8 divided by 20, or 40 percent. Gross margin counts only direct costs; operating, net, and profit margins each subtract progressively more expenses from the same revenue figure.

The minimum equity a broker requires an investor to post against a leveraged position, expressed as a percentage of the position's market value. U.S. Regulation T sets a 50 percent initial margin on most stock purchases, and FINRA Rule 4210 sets a 25 percent maintenance margin that must be held thereafter; futures, options, and forex venues set their own rates. When equity falls below the maintenance level, the broker issues a margin call and may liquidate positions if the shortfall is not cured promptly.

The tax rate that applies to the next dollar of taxable income, set by the bracket the taxpayer's income falls into under a graduated tax system. It is distinct from the effective rate, which averages the tax paid over all income. The marginal rate is the relevant figure for decisions about additional earnings, retirement contributions, and deduction timing, since each new dollar is taxed at this rate, not the average.

The amount added to the cost of a product to set its selling price, expressed either as a currency value or as a percentage of cost. A 50 percent markup on a 10 dollar item means selling it for 15 dollars. Markup and margin describe the same gap from opposite ends: markup is a percentage of cost, margin is a percentage of selling price.

The amount added to the cost of a product to set its selling price, expressed as a percentage of cost. The formula is selling price minus cost, divided by cost; a 50 percent markup on a 10 dollar item produces a 15 dollar selling price. Markup and margin describe the same gap from opposite ends, so a fixed markup percentage always corresponds to a smaller margin percentage.

Megabyte, a unit of digital information equal to 1,000,000 bytes under the SI decimal definition or 1,048,576 bytes (2^20) under the binary definition rendered as MiB in the IEC standard. Storage and bandwidth vendors use the decimal value, which is why an advertised 500 MB drive shows about 477 MiB to an operating system. Megabytes are the natural unit for medium files such as photos, MP3 audio, and short video clips.

Megabytes per second, a unit of throughput equal to 1,000,000 bytes (or 1,048,576 bytes under the binary convention) transferred each second. The unit is the natural readout for file copies, USB and SATA drive benchmarks, and SD card speed classes. Converting between MB/s and Mbit/s requires multiplying or dividing by 8, so a 100 MB/s SSD read corresponds to roughly 800 Mbit/s of raw bus traffic.

Megabits per second, a unit of network throughput equal to 1,000,000 bits transferred each second. Mbit/s, often written Mbps, is the headline figure on consumer broadband plans, where 1 Mbit/s of useful download capacity translates to roughly 125 KB/s after dividing by 8 bits per byte. ISPs and switch vendors use the SI decimal definition, so 100 Mbit/s service tops out near 12.5 megabytes per second of file transfer in practice.

The middle value in a data set when all observations are arranged in ascending order. For an odd number of values, it is the central entry; for an even number, it is the arithmetic mean of the two central entries. Because the median is unaffected by extreme outliers, we prefer it over the mean when reporting typical values in skewed distributions.

An HTML meta tag, written as <meta name="description" content="...">, that provides a short summary of a page for search engines and social previews. Search engines often display it as the snippet beneath the page title in results, though they may rewrite it when the on-page content seems more relevant. Most engines truncate the snippet near 155 to 160 characters on desktop and a bit shorter on mobile.

An equation published in 1990 for estimating basal metabolic rate from weight, height, age, and sex. It is generally considered more accurate than the older Harris-Benedict formula for modern populations. The male variant is BMR = (10 × kg) + (6.25 × cm) − (5 × age) + 5; the female variant subtracts 161 instead of adding 5.

Source text that has been mechanically reduced in size by stripping whitespace, comments, and other characters that do not affect runtime behavior. Tools such as Terser, esbuild, and SWC also rename local variables to short identifiers and apply safe expression rewrites, often shrinking the result to roughly 30 to 60 percent of the original. Minification is paired with gzip or Brotli compression in production web pipelines to cut the bytes shipped to browsers without changing program semantics.

The value that appears most often in a data set. A set may have one mode (unimodal), two modes (bimodal), several modes (multimodal), or none at all if every value is unique. Unlike the mean or median, the mode applies to categorical data as well as numerical data, which makes it useful for summarising survey responses and frequency counts.

A color scheme built from a single hue varied only by its tints, tones, and shades, holding hue constant while changing lightness and saturation. The narrow palette reads as quiet and unified, which is why monochromatic schemes appear often in luxury branding, photography editing, and minimalist UI design. Adding a small accent in a different hue is the standard remedy when the scheme starts to feel flat or fails to surface interactive elements.

The fixed amount a borrower pays each month to service a loan, covering interest accrued on the remaining balance plus a portion that reduces the principal. On a fully amortised loan, the payment stays constant while the split between interest and principal shifts over time as the balance falls. For a mortgage, the payment often also includes property tax and insurance escrow, producing the combined figure lenders call PITI.

A factor by which another value is scaled, most often used in recipe scaling, unit conversion, and activity-level calculations. Multiplying a value by 1 leaves it unchanged; multipliers greater than 1 increase it, and multipliers between 0 and 1 decrease it. A negative multiplier flips the sign of the original value in addition to scaling its magnitude.

A historical classification of IPv4 address ranges into five groups (A through E) based on the leading bits of the address. Classes A, B, and C defined default subnet masks of /8, /16, and /24 respectively, determining how many hosts each network could contain. Classful addressing has been superseded by CIDR, but the terminology persists in networking references and exam material.

A value that explicitly represents the absence of any object, reference, or data. In JSON it is one of the seven primitive types and is written as the literal token null; in SQL it marks a column with no recorded value and is excluded from most aggregate calculations and equality comparisons. Null differs from an empty string, a zero, or a missing key, all of which are concrete values rather than the absence of one.

Free of tree nuts and, in stricter usage, peanuts as well, made with no cross-contact in shared equipment or facilities. The designation matters most for people with IgE-mediated nut allergies, where trace amounts can trigger anaphylaxis. Schools, airlines, and food manufacturers use the label to mark products and environments safe for sensitized individuals.

The portion of a container's total capacity that is filled by packed objects, typically expressed in cubic units or as a percentage of the container volume. It is the complement of unused volume. Maximising occupied volume reduces shipping costs and wasted space in warehousing and logistics.

Symbols or keywords that perform an operation on one or more operands in a programming language or mathematical expression, such as + for addition or === for strict equality. Each language defines precedence and associativity rules that determine evaluation order when operators are combined.

Also known as: OCR

A process that converts images of printed or handwritten text into machine-readable character data. Modern implementations use neural networks trained on large corpora to handle varied fonts, layouts, and image quality. Accuracy degrades with low resolution, heavy skew, or complex backgrounds, so preprocessing steps like deskewing and binarization are common.

The diameter measured across the outside of a cylindrical object, from exterior surface to exterior surface through the center. It is the relevant dimension when fitting an object inside something else, such as a pipe inside a clamp or a tire on a wheel well. The abbreviation OD distinguishes it from inner diameter (ID) on engineering drawings.

Hours an employee works beyond a defined threshold that triggers a premium pay rate. Under the U.S. Fair Labor Standards Act the federal threshold is 40 hours in a workweek for non-exempt employees; California, Alaska, and several other states add a daily threshold that triggers overtime after 8 hours in a single shift. Hours that qualify count separately from regular hours on the pay stub and are usually capped or pre-approved under company policy.

Wages paid for hours worked beyond a defined threshold, typically at a premium rate. Under the U.S. Fair Labor Standards Act, non-exempt employees receive at least 1.5 times their regular rate for hours over 40 in a workweek; some states add daily thresholds or double-time rules. Salaried, exempt, and certain agricultural and transportation workers are excluded by statute.

The total number of times a page on a website is loaded or reloaded in a browser, counted by analytics platforms such as Google Analytics, Adobe Analytics, and Plausible. Each refresh, back-button return, or fresh navigation to the same URL increments the count, so page views typically exceed unique visitors and sessions. The metric is the standard denominator for ad impressions, capacity planning, and bandwidth estimation.

The number of paragraphs in a piece of text, where each paragraph is a contiguous block of prose separated from the next by one or more blank lines or by a paragraph mark in a word processor. Counting tools typically split on consecutive line breaks and ignore empty blocks, so a single line break inside a paragraph does not start a new one. The metric appears in writing assignments, content briefs, and SEO audits as a quick proxy for structural pacing.

A unit of astronomical distance equal to about 3.26 light-years, or roughly 3.086 × 10¹⁶ metres. It is defined as the distance at which one astronomical unit subtends an angle of one arcsecond, and it is the base unit astronomers use for stellar and galactic separations. Larger distances are expressed in kiloparsecs and megaparsecs.

The number of characters in a password, counted directly rather than weighted by character class. Length is the single largest contributor to brute-force resistance, because the search space grows exponentially with each added character, so a 16-character random password is far stronger than a 10-character one drawn from the same set.

A measure of how resistant a password is to guessing and brute-force attack, usually expressed as entropy in bits or as a qualitative label such as weak, moderate, or strong. It depends on length, character variety, and the avoidance of dictionary words, names, and common substitution patterns.

The interval at which an employer issues paychecks to a worker. Common schedules are weekly (52 paychecks per year), biweekly (26), semimonthly (24), and monthly (12); some industries use daily or piecework cycles. The schedule determines the divisor used to convert annual salary into per-period gross pay and is regulated in many U.S. states, which set minimum frequencies that employers cannot fall below.

A color scheme built from five hues evenly spaced 72 degrees apart on the color wheel. The wide spread covers most of the spectrum at once, so the palette reads as energetic and complex; it is also harder to balance than triadic or tetradic schemes and is rarely used at equal weight. Pentadic palettes appear most often in editorial illustration, festival graphics, and information design where each hue maps to a distinct category.

A ratio expressed as a fraction of 100, written with the % symbol. Ten percent means 10 out of every 100, or the fraction 10/100, or the decimal 0.10. Any percentage can be converted to a decimal by dividing by 100, and to a fraction by placing the value over 100 and simplifying.

A measure of how two values differ relative to their average, calculated as the absolute difference between the values divided by their mean, expressed as a percentage. Unlike percentage change, which treats one value as the reference, percentage difference treats both values symmetrically. The formula is |a - b| / ((a + b) / 2) multiplied by 100.

A price reduction expressed as a fraction of the original price, such as 20% off or 30% off. The amount saved scales with the item's price, so the same percentage produces larger absolute savings on more expensive items; retailers prefer the format for headline promotions because it reads as a single number across an entire catalog.

A unit of liquid volume equal to one half of a quart. A US pint contains 16 fluid ounces and is roughly 473 milliliters, while an imperial pint contains 20 imperial fluid ounces and is roughly 568 milliliters.

Also known as: PPI

Pixels per inch. The count of individual pixels packed into one linear inch of a display surface. Higher values produce sharper text and finer detail at close viewing distances. Beyond a certain threshold, the eye cannot resolve further gains, and additional density is wasted.

The smallest addressable units of a raster image or display, each holding one or more color samples. Image resolution is the count of pixels along each axis, and display density is measured in pixels per inch (PPI) or dots per inch (DPI).

Private mortgage insurance, a policy that protects the lender against borrower default on a conventional home loan with a down payment under 20 percent. The premium is typically 0.3 to 1.5 percent of the original loan amount per year, paid monthly along with the mortgage. Under the Homeowners Protection Act, lenders must cancel PMI automatically when the loan-to-value ratio reaches 78 percent of the original purchase price, and borrowers may request cancellation at 80 percent.

Money paid toward a loan beyond the scheduled payment, applied directly to outstanding principal rather than to interest or escrow. Reducing principal early shrinks the base on which future interest accrues, so a single prepayment shortens the loan term and lowers total interest paid even when the monthly payment stays unchanged. Some loans carry prepayment penalties or restrict prepayments to specific dates, so borrowers should check the note before sending extra funds.

The time window during which a borrower may make extra payments toward principal, often defined by the terms of the note rather than the regular payment schedule. Some loans accept prepayments at any time without restriction; others limit them to specific anniversaries, charge a prepayment penalty, or cap the share of principal that can be retired in any single year. The window matters most on commercial mortgages, fixed-rate consumer loans, and structured products where the lender priced expected interest income into the contract.

The original sum of money borrowed in a loan or invested in an instrument, excluding any interest or returns that accrue over time. In an amortisation schedule, each payment is split between interest on the outstanding principal and a portion that reduces the principal itself. As the principal shrinks, the interest share of each payment decreases.

Also known as: PMI

Insurance that protects the lender against borrower default on a conventional mortgage where the down payment is less than 20 percent of the home's value. Premiums are paid by the borrower, typically rolled into the monthly payment, and federal law requires automatic cancellation once the loan-to-value ratio reaches 78 percent of the original purchase price.

Passwords constructed from alternating consonants and vowels to form syllable-like clusters that a human can read aloud and remember. The trade-off is reduced entropy compared to a random string of the same length, because the syllable structure shrinks the effective character set.

A recurring tax that local governments levy on the assessed value of real property such as land, houses, and commercial buildings. The annual bill equals the assessed value, after any homestead or other exemptions, multiplied by the local millage rate. Revenue typically funds schools, fire and police services, and municipal infrastructure, and most U.S. mortgages collect the tax monthly into an escrow account.

The annual property-tax bill on a home, expressed in dollars per year, equal to the assessed value multiplied by the local millage rate after exemptions. Most U.S. mortgages collect the figure in equal monthly portions through an escrow account so the lender can pay the county on the borrower's behalf when the bill comes due. Effective rates vary by an order of magnitude across the country, from under 0.3 percent of market value in Hawaii to over 2 percent in parts of Illinois and New Jersey.

A macronutrient made of amino acids that supports muscle repair, enzyme production, immune function, and tissue growth. Common dietary sources include meat, fish, eggs, dairy, legumes, and soy, each gram providing about 4 calories. General intake guidelines range from 0.8 grams per kilogram of body weight for sedentary adults to 1.6 or more for athletes and those in a caloric deficit.

The share of total daily calories that comes from dietary protein, expressed as a percentage. Protein supplies 4 calories per gram and supports muscle repair, enzyme synthesis, and satiety, with no dedicated storage compartment beyond functional tissue. The Acceptable Macronutrient Distribution Range recommends 10 to 35 percent of calories from protein; athletes and people in a calorie deficit often target the upper end of that band to preserve lean mass.

The numeric values assigned to letter grades on a fixed scale, typically 4.0 for an A and 0.0 for an F, used to compute a grade point average. Each course's quality points equal the grade value multiplied by the number of credit hours. Institutions vary on whether they award 4.0 or 4.33 for an A+.

A unit of liquid volume in the US customary and imperial systems. A US quart equals 32 fluid ounces or 0.946 liters, while an imperial quart equals 40 imperial fluid ounces or 1.136 liters.

Bread leavened with baking soda or baking powder rather than yeast, requiring no fermentation or rise time. Banana bread, soda bread, cornbread, and biscuits all fall in this category; the chemical leaveners react on contact with liquid and acid, so the batter must be baked promptly to retain lift.

The distance from the centre of a circle or sphere to any point on its boundary. It equals half the diameter, and it appears in every formula that describes the size of a round shape, including circumference (2πr), area (πr²), and sphere volume ((4/3)πr³). The plural is radii.

The difference between the largest and smallest values in a data set, calculated as maximum minus minimum. Range gives a quick sense of spread but is highly sensitive to outliers, since it depends entirely on the two extreme values. For a more robust measure of variability we usually turn to the interquartile range or the standard deviation.

A comparison of two quantities that expresses how many units of one there are for each unit of the other, typically written as a:b or a/b. A ratio stays consistent under multiplication, so 3:5 conveys the same relationship as 6:10. When both quantities share the same unit, the ratio is dimensionless; when units differ, as in miles per gallon, the ratio defines a derived unit.

An effective annual percentage rate that includes lender fees, discount points, and other required closing costs in addition to the nominal interest rate. It represents the true annualized cost of borrowing and is the figure lenders must disclose under the Truth in Lending Act so applicants can compare offers on a like-for-like basis.

Land together with any permanent structures attached to it, including homes, commercial buildings, and improvements such as wells or fences. Real estate differs from personal property, which is movable. Most real estate transactions involve a deed transfer, a title search, and a closing process in which ownership formally passes from seller to buyer.

A four-sided plane figure with opposite sides of equal length and four right angles. The area of a rectangle is its length multiplied by its width; the perimeter is twice the sum of length and width. A square is the special case in which all four sides are equal.

The number of distinct pixels a display or image contains, written as width by height, such as 1920 by 1080. A higher resolution packs more pixels into the same area and resolves finer detail, at the cost of more storage and processing. Pixel density, measured in pixels per inch, determines how crisp the image appears at a given viewing distance.

An application programming interface that follows the Representational State Transfer architectural style introduced by Roy Fielding in 2000. Clients address resources through URLs and act on them with the standard HTTP methods GET, POST, PUT, PATCH, and DELETE, exchanging representations such as JSON or XML. The style favors stateless requests, cacheable responses, and uniform interfaces, which makes REST APIs straightforward to scale and to consume from any HTTP client.

The process of estimating how much income will be needed in retirement and arranging savings, investments, and benefit elections to fund it. A typical plan projects future expenses, models returns and inflation across the working years, and stacks contributions across tax-advantaged accounts such as 401(k)s, IRAs, and HSAs alongside any defined-benefit pension or Social Security. The standard sustainable-withdrawal benchmark is the 4 percent rule, which targets a 30-year retirement supported by a balanced stock and bond portfolio.

The average money a business collects from selling a single unit of product or service, equal to total revenue divided by units sold. For a single-price catalog it equals the list price; with discounts, mix shifts, or tiered pricing it falls below the headline figure. The number is a key driver of contribution margin, break-even volume, and pricing decisions.

A colour model that represents colours as combinations of red, green, and blue light, with each channel typically expressed as an integer from 0 to 255. Mixing all three channels at full intensity produces white; all at zero produces black. Screens, cameras, and digital image formats use RGB because it mirrors how human cone cells perceive colour.

A US individual retirement account funded with after-tax dollars, allowing tax-free growth and tax-free qualified withdrawals in retirement. Contributions can be withdrawn at any time without penalty, but earnings withdrawn before age 59½ generally incur a 10% penalty unless an exception applies. Annual contribution limits are set by the IRS and phase out at higher income levels.

A fixed regular payment, typically expressed as an annual amount, that an employer pays an employee in exchange for work performed. Unlike an hourly wage, salary generally does not vary with the number of hours worked in a given pay period. Gross salary precedes deductions for taxes, insurance, and retirement contributions; net salary is the amount actually deposited.

The annualized percentage by which a worker's gross pay is projected to grow each year, used as a forecasting input in retirement and compensation models. Long-run estimates typically fall between 2% and 4% to align with general wage growth and inflation; the figure compounds across a career, so a 3% annual rate doubles nominal salary in roughly 24 years.

The reduced price a seller charges during a promotion, calculated by subtracting a discount from the regular price. A 20 percent discount on a 50 dollar item produces a sale price of 40 dollars. Sale prices drive short-term demand, clear excess inventory, and anchor perceived value against the unreduced list price.

The percentage that a retailer adds to the price of a taxable sale and remits to state and local tax authorities. The combined rate stacks the state rate, any county and city rates, and special-district rates such as transit or stadium taxes; combined U.S. rates currently range from zero in five states to over 10 percent in some Louisiana and Tennessee localities. Some products, such as groceries and prescription drugs, are exempt or taxed at reduced rates by statute.

A subset of individuals or observations drawn from a larger population, used to estimate properties of that population without measuring every member. A good sample is representative of the population's structure and large enough to keep sampling error within tolerable bounds. Random sampling minimises selection bias, while stratified sampling ensures that known subgroups are proportionally represented.

The intensity or purity of a color, ranging from a fully neutral gray at zero to the most vivid version of a hue at the maximum. In HSL and HSB color models it is the second channel, expressed as a percentage from 0 to 100.

The amount a buyer pays for a product or service, set by adding a markup or margin to the seller's cost. It is the top line of most pricing calculations: revenue equals selling price multiplied by units sold. On a loss leader, selling price may fall below cost to drive traffic or clear inventory.

The punctuation mark ";" at Unicode code point U+003B, used in prose to join two independent clauses and in lists where individual items already contain commas. It is the default field separator in CSV exports from spreadsheets configured for European locales, where the comma is reserved as the decimal mark. In programming, the semicolon terminates statements in C, Java, JavaScript, and most languages descended from Algol-60.

A unit of written language that expresses a complete thought, typically containing at least one independent clause with a subject and a finite verb. In English it begins with a capital letter and ends with a period, question mark, or exclamation point; sentences may be declarative, interrogative, imperative, or exclamatory. Most word-counting tools detect sentence boundaries by terminal punctuation while accounting for abbreviations, decimal numbers, and ellipses.

A capitalization style that capitalizes only the first letter of a sentence and proper nouns, leaving the rest of the words in lowercase. It contrasts with title case, where most content words are capitalized, and is the default convention for body text, headlines at many digital publications, and UI labels in modern operating systems. Automated converters typically scan for terminal punctuation to detect sentence boundaries and preserve known proper nouns and acronyms when reflowing text.

A Simplified Employee Pension individual retirement arrangement, a tax-deferred retirement account funded entirely by employer contributions on behalf of self-employed people, small-business owners, and their eligible employees. The 2024 contribution cap is the lesser of 25 percent of compensation or 69,000 dollars per participant, and the same percentage must be applied to every eligible employee. Earnings grow tax-deferred and withdrawals after age 59 and a half are taxed as ordinary income.

The length of time a camera's sensor or film is exposed to light, measured in seconds or fractions of a second such as 1/250. Faster speeds freeze motion and reduce camera shake, while slower speeds gather more light and can introduce motion blur.

Shift JIS, a variable-width character encoding for Japanese text built on top of the JIS X 0201 and JIS X 0208 standards. Single-byte values cover ASCII and half-width katakana, while pairs of bytes encode kanji and full-width forms; the leading byte falls in reserved high-bit ranges so single and double-byte sequences can coexist without escape codes. It dominated Japanese personal computing through the 1990s and remains in legacy files, even as UTF-8 has displaced it on the modern web.

A three-dimensional surface composed of all points in space at a fixed distance from a central point. That fixed distance is the radius, and the enclosed solid has volume (4/3)πr³ and surface area 4πr². Planets, ball bearings, and water droplets approximate spheres because the shape minimises surface area for a given volume.

A three-color scheme made of one base hue plus the two hues adjacent to its direct complement on the color wheel, rather than the complement itself. The pattern keeps the high contrast of a complementary pair while softening the visual tension that pure opposites create, which is why beginning designers often start there. The base hue typically dominates the composition and the two split hues serve as accents.

A four-sided plane figure with four equal sides and four right angles, a special case of both the rectangle and the rhombus. Its area equals the side length squared, and its perimeter is four times the side length. In arithmetic, squaring a number means multiplying it by itself, which reflects the same relationship between a side and the area it generates.

A unit of area equal to the area of a square one inch on each side. It equals exactly 6.4516 square centimeters, and 144 square inches make one square foot.

The SI unit of area, equal to the area of a square one meter on each side. One square meter is approximately 10.7639 square feet, 1,550 square inches, or 1.19599 square yards.

A unit of area equal to the area of a square three feet on each side, or nine square feet. It equals 0.836127 square meters and is commonly used for carpet, fabric, and landscaping estimates in the United States and United Kingdom.

A tax levied by an individual U.S. state on income earned by its residents, and often on income earned within the state by non-residents. Rates and structures vary widely: some states use graduated brackets, others apply a single flat rate, and nine states impose no broad state income tax at all. The tax is reported on a separate state return and may be deducted on the federal return up to the SALT cap.

The percentage rate at which a U.S. state taxes a slice of taxable income earned by its residents and, in many cases, by non-residents on income sourced within the state. Top marginal rates range from zero in states with no broad income tax to over 13 percent in California; some states use a single flat rate while others apply graduated brackets. State taxable income usually starts from federal AGI and is adjusted by state-specific additions, subtractions, and deductions.

Sequences of characters treated as a single value in programming, used to represent text, identifiers, and structured data such as JSON. Strings are typically delimited by quote marks in source code and stored in an encoding such as UTF-8 or UTF-16.

A 32-bit value that divides an IPv4 address into a network portion and a host portion by masking the leading bits. A mask of 255.255.255.0 (/24) reserves the first 24 bits for the network, leaving 8 bits for up to 254 usable host addresses. Subnet masks enable a single IP block to be partitioned into smaller, independently routable segments.

A volumetric unit used in cooking, equal to three teaspoons. A US tablespoon is approximately 14.79 milliliters, while a metric tablespoon is 15 milliliters and an Australian tablespoon is 20 milliliters.

The grade point average a student aims to reach by the end of a term, semester, or academic career. Students typically calculate the minimum grades needed in remaining coursework to hit the target, working backward from cumulative credit hours already completed and the GPA those credits produced.

A desired profit margin used to back into a selling price from a known cost. The required price equals cost divided by one minus the target margin expressed as a decimal; for example, a 12 dollar cost with a 40 percent target margin requires a 20 dollar selling price. Retailers and service businesses set target margins by category to ensure each line clears its share of overhead and contributes to profit.

A desired markup percentage used to set a selling price from a known cost. The required price equals cost multiplied by one plus the markup expressed as a decimal; a 10 dollar cost with a 50 percent target markup yields a 15 dollar selling price. Markup-based pricing is common in cost-plus contracts and inventory-heavy retail because it slots in cleanly at the line-item level, even though the resulting margin percentage is always smaller than the markup.

A pricing convention in which the figure shown to the buyer already contains applicable sales tax, value-added tax, or goods-and-services tax. Most European Union retail prices, for example, must be displayed tax-inclusive under consumer-protection rules, while U.S. retailers typically show tax-exclusive prices and add tax at checkout. Backing tax out of an inclusive price uses the formula price divided by one plus the tax rate to recover the pre-tax base.

Terabyte, a unit of digital information equal to 1,000,000,000,000 bytes under the SI decimal definition or 1,099,511,627,776 bytes (2^40) under the binary definition written as TiB. Hard drive and SSD vendors quote capacity in decimal terabytes, which is the reason a 2 TB drive shows roughly 1.82 TiB after formatting. Terabytes are the working unit for desktop storage, backup volumes, and small-scale data warehouses.

A volumetric unit used in cooking, equal to one third of a tablespoon. A US teaspoon is approximately 4.93 milliliters, and most other systems round it to 5 milliliters.

Body mass index for individuals aged 2 through 19, interpreted against age- and sex-specific percentile charts rather than the fixed adult cutoffs of 18.5, 25, and 30. The CDC growth charts classify a child below the 5th percentile as underweight, the 5th to 84th as healthy weight, the 85th to 94th as overweight, and at or above the 95th as obese.

A growth-chart-based interpretation of body mass index for children and adolescents aged 2 through 19, expressed as the percentile of BMI for a child's age and sex against CDC reference data. The percentile bands replace the fixed adult cutoffs to account for normal changes in body composition during growth: under the 5th percentile is underweight, 5th to 84th is healthy weight, 85th to 94th is overweight, and 95th and above is obesity. Pediatricians plot the value at each well-child visit to track trajectory rather than to read a single result.

A grade point average computed only from courses taken in a single term, ignoring the rest of a student's transcript. It isolates one term's academic performance and is the input used to update the cumulative GPA at the end of each grading period.

A color scheme built from four hues that form a rectangle or square on the color wheel, made up of two pairs of complementary colors. The combination delivers the highest variety of any standard scheme and works best when one hue dominates and the others act as accents, since equal weights tend to feel chaotic. Tetradic palettes appear often in editorial illustration, pop-art posters, and brand systems that need to telegraph energy or playfulness.

The number of tokens, the discrete pieces of text that a language model processes, in a given input or output. Tokens are produced by a tokenizer such as Byte Pair Encoding or WordPiece and may be whole words, subword fragments, or single characters; in English text, one token averages roughly four characters or three quarters of a word. Token count drives both context-window limits and per-call cost on commercial model APIs.

Often abbreviated TDEE, the total number of calories a person burns in a day, combining basal metabolic rate with the energy cost of physical activity, digestion, and non-exercise movement. TDEE is typically estimated by multiplying BMR by an activity factor ranging from 1.2 for sedentary adults to 1.9 for extremely active athletes. We use TDEE as the baseline for setting calorie targets in weight maintenance, loss, or gain.

Also known as: TDEE

The total number of calories the body burns in a 24-hour period, combining basal metabolic rate, the thermic effect of food, and energy spent on physical activity. It is commonly estimated by multiplying BMR by an activity factor ranging from 1.2 (sedentary) to 1.9 (very intense daily exercise). Eating above TDEE leads to weight gain; eating below it leads to weight loss.

The sum of all interest payments a borrower will make over the life of a loan, equal to total scheduled payments minus the original principal. On an amortizing loan it depends on the loan amount, interest rate, term, and payment schedule; longer terms and higher rates raise the total even when each monthly payment is smaller. Extra principal payments or refinancing at a lower rate reduce it.

The cumulative interest a borrower has paid on a loan from origination through a given date, equal to the sum of the interest portion of every payment made so far. On an amortizing loan this figure rises quickly in the early years, when each payment is mostly interest, and slows as the principal shrinks. Lenders disclose the running total on monthly statements and on annual tax forms such as the U.S. Form 1098.

The sum of grade points multiplied by credit hours across every course on a student's transcript. Dividing total quality points by total attempted credit hours produces the grade-point average; the figure weights higher-credit courses proportionally more than low-credit ones.

A four-sided plane figure with exactly one pair of parallel sides, called the bases. The non-parallel sides may be equal in length (an isosceles trapezoid) or unequal. Area equals half the sum of the two base lengths multiplied by the perpendicular distance between them: ((a + b) / 2) times h.

A color scheme built from three hues evenly spaced 120 degrees apart on the color wheel, such as red, yellow, and blue or orange, green, and violet. The wide separation gives high contrast and visual energy while keeping the palette balanced, which is why triadic schemes appear often in posters, children's media, and brand identity. Designers usually anchor the composition with one dominant hue and use the other two as supporting accents to avoid visual chaos.

A closed plane figure formed by three straight sides and three interior angles that sum to 180 degrees. Triangles are classified by side length as equilateral, isosceles, or scalene, and by angle as acute, right, or obtuse. The right triangle, which contains one 90-degree angle, is the basis for trigonometry and the Pythagorean theorem.

An obsolete fixed-width character encoding that represents every code point in the Basic Multilingual Plane as a single 16-bit code unit. Defined in the 1990 ISO/IEC 10646 standard, it could address 65,536 characters but had no mechanism for the supplementary planes added in Unicode 2.0. UTF-16 superseded it in 1996 by introducing surrogate pairs for code points above U+FFFF; the term UCS-2 still appears in older Windows and database documentation, usually as a loose synonym for UTF-16 without surrogates.

A fixed-width 16-bit encoding of the Universal Character Set in big-endian byte order, where the high-order byte of each code unit is stored first. UCS-2 covers only the Basic Multilingual Plane (code points U+0000 through U+FFFF), so characters above that range, including most emoji and historic scripts, cannot be represented; UTF-16 superseded it by adding surrogate pairs.

A fixed-width 16-bit encoding of the Universal Character Set in little-endian byte order, where the low-order byte of each code unit is stored first. It is the byte order historically used on x86 Windows, often paired with a U+FEFF byte order mark at the start of files; like all UCS-2 variants it cannot represent code points above U+FFFF.

A fixed-width character encoding from ISO/IEC 10646 that stores every code point as a single 32-bit code unit, giving direct access to the full 31-bit code-point range originally defined for the Universal Character Set. The Unicode Consortium and ISO have since capped the usable range at U+10FFFF and aligned UCS-4 with UTF-32, so the two names refer to the same byte-level encoding in modern use. The format is rare in storage and on the wire because it consumes four bytes per character but is convenient as an in-memory representation when constant-time indexing matters.

A 32-bit Unicode encoding form, big-endian, that represents each code point as a fixed four-byte sequence with the most significant byte first. It is equivalent to UTF-32BE and is uncommon outside specialized data exchange because of its fourfold size relative to UTF-8 for ASCII text.

A 32-bit Unicode encoding form, little-endian, that represents each code point as a fixed four-byte sequence with the least significant byte first. It is equivalent to UTF-32LE, and the byte order matches that of x86 and ARM little-endian processors, simplifying memory reads on those platforms.

A consumer marketing label for the 3840 by 2160 pixel display resolution, also called 4K UHD or 2160p, with four times the pixel count of Full HD at the same 16:9 aspect ratio. The format is the standard for current-generation televisions, streaming masters from Netflix and YouTube, and most modern game consoles. It is distinct from the cinema-oriented DCI 4K resolution of 4096 by 2160, which uses a slightly wider 17:9 ratio.

A universal character-encoding standard that assigns a unique code point to every character across the world's writing systems, plus symbols, emoji, and control codes. It defines over 149,000 characters across more than 160 scripts and is implemented through encoding forms such as UTF-8, UTF-16, and UTF-32.

The portion of a container's total capacity not occupied by packed objects, representing wasted space. It is calculated as total container volume minus occupied volume. Reducing unused volume is a primary goal in freight loading, warehouse slotting, and packaging design.

The proportion of time that a system, service, or device has been operational and reachable over a stated measurement window, usually expressed as a percentage. Service-level agreements quote uptime in "nines": 99.9 percent allows about 8.77 hours of downtime per year, 99.99 percent about 52.6 minutes, and 99.999 percent about 5.26 minutes. The figure typically excludes scheduled maintenance and is the primary penalty trigger in commercial cloud-service contracts.

A Uniform Resource Locator, the text string that identifies the location of a resource on the web, such as https://kaltask.com/tools. A URL has several components: the scheme (http or https), the host (kaltask.com), an optional port, a path, and an optional query string. Browsers and agents parse the URL to resolve the server, open a connection, and request the resource.

A variant of Base64 that substitutes the standard plus and slash characters with hyphen and underscore, producing output that survives unescaped in URLs, filenames, and HTTP query strings. Trailing equals-sign padding is often omitted as well. The encoding is defined in RFC 4648 section 5 and is used by JSON Web Tokens, OAuth identifiers, and most other Base64 payloads carried in URL paths.

The ISO 4217 currency code for the United States dollar, the official currency of the United States and its territories and the most-held reserve currency in the world. The dollar is divided into 100 cents and is also the official currency of several other economies, including Ecuador, El Salvador, and the British Virgin Islands. Because most commodities and a majority of international debt are priced in USD, its exchange rate is the standard quote convention against most other currencies.

A variable-width Unicode encoding that stores each code point as one or two 16-bit code units. Code points in the Basic Multilingual Plane occupy a single unit; supplementary characters above U+FFFF use a surrogate pair of two units. UTF-16 has big-endian and little-endian byte orders, distinguished by an optional byte-order mark or by the explicit suffixes BE and LE.

A variable-width Unicode encoding that uses one 16-bit code unit for code points in the Basic Multilingual Plane and a surrogate pair of two units for code points above U+FFFF. The default form omits an explicit byte-order mark and is interpreted as big-endian per the Unicode standard, though many systems treat the form without a BOM as little-endian on x86 platforms; it is the native string encoding of Java, JavaScript, and the Windows API.

The big-endian byte serialization of UTF-16, in which the most significant byte of each 16-bit code unit is written first. The encoding name implies that no byte-order mark is present; an optional BOM at the start of a stream is treated as a literal U+FEFF character rather than as a byte-order signal. Network protocols and file formats that need a fixed byte order, such as the JVM class file format, specify UTF-16BE explicitly.

The little-endian byte serialization of UTF-16, in which the least significant byte of each 16-bit code unit is written first. The encoding name implies no byte-order mark is present; any leading U+FEFF is treated as data rather than as a byte-order signal. Windows uses UTF-16LE as the on-disk and in-memory representation for its native wide-character APIs and most NTFS metadata.

A fixed-width Unicode encoding that represents every code point as a single 32-bit code unit. The fixed width makes random access by character position trivial, but doubles the storage of UTF-16 and quadruples that of plain ASCII text under UTF-8. Like UTF-16, it has big-endian and little-endian variants identified by a byte-order mark or by the BE and LE suffixes.

The big-endian byte serialization of UTF-32, in which the most significant byte of each 32-bit code unit is written first. As with UTF-16BE, the explicit endian suffix means no byte-order mark is present; a leading U+FEFF, if any, is treated as a regular character. The format is rare on disk because it consumes four bytes per code point but is used internally where fixed-width random access matters more than storage size.

The little-endian byte serialization of UTF-32, in which the least significant byte of each 32-bit code unit is written first. The explicit endian suffix means no byte-order mark is present; a leading U+FEFF is treated as a regular character. Like UTF-32BE, it sees little use in interchange because of its size but is convenient as an in-memory representation when constant-time indexing into a code-point array is required.

A character-encoding form that represents Unicode text using only 7-bit ASCII bytes, designed for transports that strip or corrupt the high bit, such as early SMTP and MIME headers. Non-ASCII code points are encoded in modified Base64 sequences delimited by plus and minus signs. Defined in RFC 2152 and now largely obsolete, since UTF-8 traverses the same channels and avoids the parsing ambiguities that made UTF-7 a security hazard.

A modified form of UTF-7 used by the IMAP4 mail protocol to represent non-ASCII characters in mailbox names, defined in RFC 3501 as "modified UTF-7." It differs from standard UTF-7 by using the ampersand instead of the plus sign as the shift character, and by replacing the slash in the Base64 alphabet with a comma so that mailbox names remain safe in IMAP path syntax. Modern IMAP servers may also offer UTF-8 mailbox names through the IMAP4rev2 standard, but UTF7-IMAP remains the interoperable default.

The measure of three-dimensional space enclosed by a solid, expressed in cubic units such as cubic metres or litres. Common formulas include length times width times height for a rectangular prism, πr²h for a cylinder, and (4/3)πr³ for a sphere. Volume determines capacity for containers, dosage for fluids, and material quantity for fabrication.

The total internal capacity of an enclosure, measured in cubic units such as cubic centimetres, litres, or gallons. It sets the upper bound on how much material or how many objects can be stored or shipped inside. Irregularly shaped containers require geometric decomposition or water-displacement measurement to determine their true volume.

A technology that creates an encrypted tunnel between a device and a remote server, routing traffic through that server so the device's original IP address is hidden from destination sites. We use the term broadly to cover both corporate VPNs, which grant remote employees access to internal networks, and consumer VPN services, which primarily offer privacy and geo-unblocking.

The planned arrangement of storage zones, aisles, docks, and staging areas within a warehouse, designed to minimise travel distance and maximise throughput. Common patterns include U-flow, through-flow, and cross-dock configurations. Layout decisions directly affect picking speed, replenishment efficiency, and overall labour cost per order.

An increase in total body mass, most often pursued intentionally through a calorie surplus and progressive resistance training, or treated clinically when it reflects recovery from illness. A surplus of roughly 3,500 calories corresponds to about one pound of body mass, but the split between muscle and fat depends on training intensity, protein intake, and sleep. Gains of 0.25 to 0.5 kilograms per week tend to favour lean-mass growth over fat accumulation.

A reduction in total body mass, most often pursued by sustaining a calorie deficit through diet, exercise, or both. A deficit of roughly 3,500 calories corresponds to about one pound of fat, though individual results vary with body composition, metabolic rate, and hormonal factors. Rapid loss typically reflects water and glycogen depletion rather than fat reduction, which is why clinicians recommend a gradual rate of 0.5 to 1 kilogram per week.

A human-readable data serialisation format that uses indentation to represent hierarchy, commonly used for configuration files and data exchange. It supports scalars, sequences, and mappings without requiring braces or brackets. YAML is a strict superset of JSON, meaning any valid JSON document is also valid YAML.

The income return on an investment, expressed as an annual percentage of the amount invested. For a bond, yield combines coupon payments with any gain or loss from holding the bond to maturity; for a stock, dividend yield is the annual dividend divided by the current share price. Yield differs from total return because it excludes capital gains beyond scheduled cash flows.