Units of area

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OR:

Unit may refer to:

# Arts and entertainment

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UNIT Unit may refer to: Arts and entertainment * UNIT, a fictional military organization in the science fiction television series ''Doctor Who'' * Unit of action, a discrete piece of action (or beat) in a theatrical presentation Music * ''Unit'' (al ...
, a fictional military organization in the science fiction television series ''Doctor Who'' * Unit of action, a discrete piece of action (or beat) in a theatrical presentation

## Music

* ''Unit'' (album), 1997 album by the Australian band Regurgitator * The Units, a synthpunk band

## Television

* ''
The Unit ''The Unit'' is an American action-drama television series created by David Mamet that aired on CBS from March 7, 2006, to May 10, 2009 with the total of four seasons and 69 episodes. The series focuses on a top-secret military unit modeled ...
'', an American television series * '' The Unit: Idol Rebooting Project'', South Korean reality TV survival show

* Stock keeping unit, a discrete inventory management construct *
Strategic business unit A strategic business unit (SBU) in business strategic management, is a profit center which focuses on product offering and market segment. SBUs typically have a discrete marketing plan, analysis of competition, and marketing campaign, even thou ...
, a profit center which focuses on product offering and market segment *
Unit of account In economics, unit of account is one of the money functions. A unit of account is a standard numerical monetary unit of measurement of the market value of goods, services, and other transactions. Also known as a "measure" or "standard" of rela ...
, a monetary unit of measurement * Unit coin, a small coin or medallion (usually military), bearing an organization's insignia or emblem *
Work unit A work unit or ''danwei'' () is the name given to a place of employment in the People's Republic of China. The term ''danwei'' remains in use today, as people still use it to refer to their workplace. However, it is more appropriate to use ''danwe ...
, the name given to a place of employment in the People's Republic of China

# Science and technology

## Science and medicine

* Unit, a vessel or section of a
chemical plant A chemical plant is an industrial process plant that manufactures (or otherwise processes) chemicals, usually on a large scale. The general objective of a chemical plant is to create new material wealth via the chemical or biological transform ...
* Blood unit, a measurement in blood transfusion *
Enzyme unit The enzyme unit, or international unit for enzyme (symbol U, sometimes also IU) is a unit of enzyme's catalytic activity. 1 U (μmol/min) is defined as the amount of the enzyme that catalyzes the conversion of one micro mole of substrate per m ...
, a measurement of active enzyme in a sample * Equivalent (chemistry), a unit of measurement used in chemistry and biology *
Geological unit A stratigraphic unit is a volume of rock of identifiable origin and relative age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or paleontologic features ( facies) that characterize ...
or rock unit, a volume of identifiable rock or ice *
International unit In pharmacology, the international unit (IU) is a unit of measurement for the effect, not mass of a substance; the variance is based on the biological activity or effect, for the purpose of easier comparison across similar ''forms'' of substance ...
, a unit of measurement for nutrients and drugs *
Unit of measurement A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. Any other quantity of that kind can be expressed as a multi ...
, a definite magnitude of a physical quantity, defined and adopted by convention or by law **
International System of Units The International System of Units, known by the international abbreviation SI in all languages and sometimes pleonastically as the SI system, is the modern form of the metric system and the world's most widely used system of measurement. E ...
(SI), modern form of the metric system ** English units, historical units of measurement used in England up to 1824 ** Humorous units of measurement Some less serious or controversial units ** Unit of length ***
Astronomical unit The astronomical unit (symbol: au, or or AU) is a unit of length, roughly the distance from Earth to the Sun and approximately equal to or 8.3 light-minutes. The actual distance from Earth to the Sun varies by about 3% as Earth orbits ...
, a unit of length roughly between the Earth and the Sun **
Natural unit In physics, natural units are physical units of measurement in which only universal physical constants are used as defining constants, such that each of these constants acts as a coherent unit of a quantity. For example, the elementary charge m ...
, a physical unit of measurement *
Unit type In the area of mathematical logic and computer science known as type theory, a unit type is a type that allows only one value (and thus can hold no information). The carrier (underlying set) associated with a unit type can be any singleton set ...
, a type allowing only one value in type theory * Unit of alcohol, a measure of the volume of pure ethanol in an alcoholic beverage

## Computing

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Central processing unit A central processing unit (CPU), also called a central processor, main processor or just processor, is the electronic circuitry that executes instructions comprising a computer program. The CPU performs basic arithmetic, logic, controlling, ...
, the electronic circuitry within a computer that carries out the instructions of a computer program *
GNU Units GNU Units is a cross-platform computer program for conversion of units of quantities. It has a database of measurement units, including esoteric and historical units. This for instance allows conversion of velocities specified in furlongs per fo ...
, a software program for unit conversion *
Rack unit A rack unit (abbreviated U or RU) is a unit of measure defined as . It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby th ...
, a unit of measure most commonly used to define the size of certain computing equipment

## Mathematics

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Unit (ring theory) In algebra, a unit of a ring is an invertible element for the multiplication of the ring. That is, an element of a ring is a unit if there exists in such that vu = uv = 1, where is the multiplicative identity; the element is unique for thi ...
, an element that is invertible with respect to ring multiplication * Unit,
identity element In mathematics, an identity element, or neutral element, of a binary operation operating on a set is an element of the set that leaves unchanged every element of the set when the operation is applied. This concept is used in algebraic structures ...
* Unit, a
tuple In mathematics, a tuple is a finite ordered list (sequence) of elements. An -tuple is a sequence (or ordered list) of elements, where is a non-negative integer. There is only one 0-tuple, referred to as ''the empty tuple''. An -tuple is def ...
of length 0; an empty tuple * Statistical unit, a data point on which statistical analysis is performed * Unit angle, a full turn equal to an angle of 1 *
Unit circle In mathematics, a unit circle is a circle of unit radius—that is, a radius of 1. Frequently, especially in trigonometry, the unit circle is the circle of radius 1 centered at the origin (0, 0) in the Cartesian coordinate system in the Euc ...
, a circle with a radius of length 1 * Unit cube, a cube with sides of length 1 *
Unit fraction A unit fraction is a rational number written as a fraction where the numerator is one and the denominator is a positive integer. A unit fraction is therefore the reciprocal of a positive integer, 1/''n''. Examples are 1/1, 1/2, 1/3, 1/4, 1/5, ...
, a reciprocal of a positive integer * Unit imaginary number, square root of negative 1 $\left(\sqrt\right)$ * Unit impulse, an impulse of height 1 *
Unit interval In mathematics, the unit interval is the closed interval , that is, the set of all real numbers that are greater than or equal to 0 and less than or equal to 1. It is often denoted ' (capital letter ). In addition to its role in real analysi ...
, an interval of distance 1 * Unit matrix, a diagonal matrix such that all elements on the main diagonal are 1 and all the others are zero * Unit number, the number 1 * Unit round-off, an upper bound on the relative error due to rounding in floating point * Unit set, a singleton, a set with exactly 1 element *
Unit sphere In mathematics, a unit sphere is simply a sphere of radius one around a given center. More generally, it is the set of points of distance 1 from a fixed central point, where different norms can be used as general notions of "distance". A uni ...
, a sphere with a radius of length 1 *
Unit square In mathematics, a unit square is a square whose sides have length . Often, ''the'' unit square refers specifically to the square in the Cartesian plane with corners at the four points ), , , and . Cartesian coordinates In a Cartesian coordina ...
, a square with sides of length 1 * Unit vector, a vector with length equal to 1

# Military

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Active service unit An active service unit (ASU; ) was a Provisional Irish Republican Army (IRA) cell of four to ten members, tasked with carrying out armed attacks. In 2002, the IRA had about 1,000 active members of which about 300 were in active service units. ...
, the former Provisional Irish Republican Army cell * Military unit, an homogeneous military organization whose administrative and command functions are self-contained *
Sayeret Matkal General Staff Reconnaissance Unit (formerly Unit 269 or Unit 262), more commonly known as Sayeret Matkal ( he, סיירת מטכ״ל) is the special reconnaissance unit (''sayeret'') of Israel's General Staff (''matkal''). It is the prime specia ...
(The Unit), the Israeli special forces unit

# Other uses

* Unit (Cristian Fleming) (born 1974), electronic musician based in New York City * Unit (housing), a self-contained suite of rooms within a set of similar dwellings * Unit (Norway), a government directorate * Unit,
course credit A credit is the recognition for having taken a course at school or university, used as measure if enough hours have been made for graduation. University credits United States Credit hours In a college or university in the United States, student ...
at a school or other educational institution *
Multiple unit A multiple-unit train or simply multiple unit (MU) is a self-propelled train composed of one or more carriages joined together, which when coupled to another multiple unit can be controlled by a single driver, with multiple-unit train contr ...
, self-propelled train carriage capable of coupling other units of the same type