# Unit

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> Source: https://en.wikipedia.org/wiki/Unit
> Source revision: 1351597427
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{wiktionary|unit}}
'''Unit''' may refer to:
{{TOC right}}

== General measurement ==
* [Unit of measurement](/source/Unit_of_measurement), a definite magnitude of a physical quantity, defined and adopted by convention or by law
**[International System of Units](/source/International_System_of_Units) (SI), modern form of the metric system
**[English units](/source/English_units_of_measurement), historical units of measurement used in England up to 1824
**[Unit of length](/source/Unit_of_length)

==Science and technology==

=== Physical sciences ===
* [Natural unit](/source/Natural_unit), a physical unit of measurement
* [Geological unit](/source/Geological_unit) or rock unit, a volume of identifiable rock or ice
* [Astronomical unit](/source/Astronomical_unit), a unit of length roughly between the Earth and the Sun

===Chemistry and medicine===
* [Equivalent (chemistry)](/source/Equivalent_(chemistry)), a unit of measurement used in chemistry and biology
* Unit, a vessel or section of a [chemical plant](/source/chemical_plant)
* [Blood unit](/source/Blood_unit), a measurement in blood transfusion
* [Enzyme unit](/source/Enzyme_unit), a measurement of active enzyme in a sample
* [International unit](/source/International_unit), a unit of measurement for nutrients and drugs

===Mathematics===
* Unit number, the number [1](/source/1)
* Unit, [identity element](/source/identity_element)
* [Unit (ring theory)](/source/Unit_(ring_theory)), an element that is invertible with respect to ring multiplication
* Unit, a [tuple](/source/tuple) of length 0; an empty tuple
* [Statistical unit](/source/Statistical_unit), a data point on which statistical analysis is performed
* [Unit angle](/source/Unit_angle), a full turn equal to an angle of 1
* [Unit circle](/source/Unit_circle), a circle with a radius of length 1
* [Unit cube](/source/Unit_cube), a cube with sides of length 1
* [Unit fraction](/source/Unit_fraction), a reciprocal of a positive integer
* [Unit imaginary number](/source/Unit_imaginary_number), square root of negative 1   <math>(\sqrt{-1})</math>
* [Unit impulse](/source/Unit_impulse), an impulse of height 1
* [Unit interval](/source/Unit_interval), an interval of distance 1
* [Unit matrix](/source/Unit_matrix), a diagonal matrix such that all elements on the main diagonal are 1 and all the others are zero
* [Unit round-off](/source/Unit_round-off), an upper bound on the relative error due to rounding in floating point 
* [Unit set](/source/Unit_set), a singleton, a set with exactly 1 element
* [Unit sphere](/source/Unit_sphere), a sphere with a radius of length 1
* [Unit square](/source/Unit_square), a square with sides of length 1
* [Unit vector](/source/Unit_vector), a vector with length equal to 1
* [Unit type](/source/Unit_type), a type allowing only one value in type theory

===Computing===
* [Central processing unit](/source/Central_processing_unit), the electronic circuitry within a computer that carries out the instructions of a computer program
* [GNU Units](/source/GNU_Units), a software program for unit conversion
* [Rack unit](/source/Rack_unit), a unit of measure most commonly used to define the size of certain computing equipment
* [Unit testing](/source/Unit_testing), a method by which individual units of source code are tested

==Business==
* [Stock keeping unit](/source/Stock_keeping_unit), a discrete inventory management construct
* [Strategic business unit](/source/Strategic_business_unit), a profit center which focuses on product offering and market segment
* [Unit of account](/source/Unit_of_account), a monetary unit of measurement
* [Unit coin](/source/Unit_coin), a small coin or medallion (usually military), bearing an organization's insignia or emblem
* [Work unit](/source/Work_unit), the name given to a place of employment in the People's Republic of China
* [Telephone card](/source/Telephone_card) unit. When bought contains a certain amount of units, which make up their own currency for making telephone calls, that may not necessarily correspond to the monetary cost of the actual telephone card.

==Military==
* [Active service unit](/source/Active_service_unit), the former Provisional Irish Republican Army cell
* [Military unit](/source/Military_unit), an homogeneous military organization whose administrative and command functions are self-contained
* [Sayeret Matkal](/source/Sayeret_Matkal) (The Unit), the Israeli special forces unit

==Arts and entertainment==
* [UNIT](/source/UNIT), a fictional military organization in the science fiction television series ''Doctor Who''
* [Unit of action](/source/Unit_of_action), a discrete piece of action (or beat) in a theatrical presentation

===Music===
* [Album-equivalent unit](/source/Album-equivalent_unit), a unified measure of music sales across traditional and digital formats
* [''Unit'' (album)](/source/Unit_(album)), 1997 album by the Australian band Regurgitator
* [The Units](/source/The_Units), a synthpunk band

===Television===
* ''[The Unit](/source/The_Unit)'', an American television series
* ''[The Unit: Idol Rebooting Project](/source/The_Unit%3A_Idol_Rebooting_Project)'', South Korean reality TV survival show

==Other uses==
* [Unit of alcohol](/source/Unit_of_alcohol), a measure of the volume of pure ethanol in an alcoholic beverage
* [Unit (currency)](/source/Unit_(currency)), a proposal for a new international currency developed by the BRICS+ Business Council
* [Unit (housing)](/source/Unit_(housing)), a self-contained suite of rooms within a set of similar dwellings
* Unit, [course credit](/source/course_credit) at a school or other educational institution
* Prison Unit, a group of [cells](/source/prison_cell) forming a cellblock or complex within a [prison](/source/prison), such as the [John B. Connally Unit](/source/John_B._Connally_Unit), or [Unit 32](/source/Unit_32).
* [Multiple unit](/source/Multiple_unit), self-propelled train carriage capable of coupling other units of the same type
* [Head unit](/source/Head_unit), a component of a stereo system mounted inside of a vehicle
* [Unit (Cristian Fleming)](/source/Unit_(Cristian_Fleming)) (born 1974), electronic musician based in New York City
* [Unit (Norway)](/source/Unit_(Norway)), a government directorate

==See also==
* [Air unit (disambiguation)](/source/Air_unit_(disambiguation))
* [Piece (disambiguation)](/source/Piece_(disambiguation))
* [Subunit (disambiguation)](/source/Subunit_(disambiguation))
* [Changan UNI-T](/source/Changan_UNI-T), a compact crossover SUV
* [Uni.T](/source/Uni.T), a South Korean girl group
* [UNITA](/source/UNITA), the second-largest political party in Angola
* [Unite (disambiguation)](/source/Unite_(disambiguation))
* [Unity (disambiguation)](/source/Unity_(disambiguation))
* [United (disambiguation)](/source/United_(disambiguation))
* {{lookfrom}}
* {{intitle}}

{{disambiguation}}

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Adapted from the Wikipedia article [Unit](https://en.wikipedia.org/wiki/Unit) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Unit?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.