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The word 'unit' means any of several things:

★ Unit (housing), in Australia/New Zealand - a self-contained suite of rooms within a set of similar dwellings.

★ Units of measurement, a fundamental quantity of measurement

★ Units (Unix), a command-line computer program that does unit conversion

★ Units conversion by factor-label, a widely used approach for performing unit conversions

★ A unit can be a general word for a module or device. For more specific example, see next entry.

★ Functional unit, a component of a computer system such as the CPU

★ A unit can refer to a self-contained section of a building (or maybe a structure such as a cabin) meant to be rented or otherwise occupied by a party, such as an apartment or business suite. See Apartment.

★ In chemical engineering, a unit is a (usually) large vessel or section of a plant in which a unit operation goes on. See Chemical plant#Chemical processes.

★ Unit of action, a discrete piece of action (or beat) in a theatrical presentation

★ Multiple unit, a passenger train whose carriages have their own motors

★ United Nations Intelligence Taskforce, a fictional entity in the ''Doctor Who'' television series

★ Unit (album), an indie pop album by the Australian band ''Regurgitator''

★ Unit of alcohol, 10 millilitres of pure ethanol in the UK

★ In biochemistry, unit is the measure of enzyme activity.

★ In a 19-inch rack a ''rack unit'' is a standard height of 1.75 inches

★ Military units, including:

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★ Unit 101, an Israeli special operations unit

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★ Unit 731, a covert medical experiment unit of the Imperial Japanese Army, which researched biological warfare through human experimentation during the Second Sino-Japanese War (1937-1945) and World War II

★ G-Unit, a hip-hop music group

★ ''The Unit'', a television series

★ A Strategic business unit

★ In filmmaking, see second unit.
In mathematics:

★ Unit vector, a vector with length 1

★ Unit circle, the circle with radius 1 centered at the origin

★ Unit interval, the interval of all real numbers between 0 and 1

★ Imaginary unit, ''i'', whose square is -1

★ Root of unity, a complex number, a power of which is 1

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

★ Unit type, a type that allows only one value

★ In category theory, there is a natural transformation called the unit from the identity functor to the composition of two adjoint functors