Unit may refer to:
General measurement

Unit of measurement, a definite magnitude of a physical quantity, defined and adopted by convention or by law

International System of Units (SI), modern form of the metric system

English units, historical units of measurement used in England up to 1824

Unit of length

Humorous units of measurement Some less serious or controversial units
Science and technology
Physical sciences

Natural unit, a physical unit of measurement

Geological unit or rock unit, a volume of identifiable rock or ice

Astronomical unit, a unit of length roughly between the Earth and the Sun
Chemistry and medicine

Equivalent (chemistry), a unit of measurement used in chemistry and biology

Unit, a vessel or section of a chemical plant

Blood unit, a measurement in blood transfusion

Enzyme unit, a measurement of active enzyme in a sample

International unit, a unit of measurement for nutrients and drugs
Mathematics

Unit number, the number 1

Unit, identity element

Unit (ring theory), an element that is invertible with respect to ring multiplication

Unit, a tuple 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, a circle with a radius of length 1

Unit cube, a cube with sides of length 1

Unit fraction, a reciprocal of a positive integer

Unit imaginary number, square root of negative 1 $(\backslash sqrt\{1\})$

Unit impulse, an impulse of height 1

Unit interval, 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 roundoff, 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, a sphere with a radius of length 1

Unit square, a square with sides of length 1

Unit vector, a vector with length equal to 1

Unit type, a type allowing only one value in type theory
Computing

Central processing unit, the electronic circuitry within a computer that carries out the instructions of a computer program

GNU Units, a software program for unit conversion

Rack unit, a unit of measure most commonly used to define the size of certain computing equipment

Unit testing, a method by which individual units of source code are tested
Business

Stock keeping unit, a discrete inventory management construct

Strategic business unit, a profit center which focuses on product offering and market segment

Unit of account, a monetary unit of measurement

Unit coin, a small coin or medallion (usually military), bearing an organization's insignia or emblem

Work unit, the name given to a place of employment in the People's Republic of China
Military

Active service unit, the former Provisional Irish Republican Army cell

Military unit, an homogeneous military organization whose administrative and command functions are selfcontained

Sayeret Matkal (The Unit), the Israeli special forces unit
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 (album), 1997 album by the Australian band Regurgitator

The Units, a synthpunk band
Television

The Unit, an American television series

, South Korean reality TV survival show
Other uses

Unit of alcohol, a measure of the volume of pure ethanol in an alcoholic beverage

Unit (housing), a selfcontained suite of rooms within a set of similar dwellings

Unit, course credit at a school or other educational institution

Multiple unit, selfpropelled train carriage capable of coupling other units of the same type

Head unit, a component of a stereo system mounted inside of a vehicle

Unit (Cristian Fleming) (born 1974), electronic musician based in New York City

Unit (Norway), a government directorate
See also

Air unit (disambiguation)

Piece (disambiguation)

Subunit (disambiguation)

UNITA, the secondlargest political party in Angola

Unite (disambiguation)

Unity (disambiguation)

United (disambiguation)
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