Unit may refer to: In mathematics: - Unit vector, a vector with length equal to 1
- Unit circle, the circle with radius equal to 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, a natural transformation (called the unit) from the identity functor to the composition of two adjoint functors
- In statistics, a statistical unit is one member of the class of objects being studied
In science and technology: - Units of measurement, a fundamental quantity of measurement
- In biochemistry, a unit is the measure of enzyme activity[citation needed]
- Unit of electricity, one kilowatt hour of mains electricity
- Units conversion by factor-label, a widely used approach for performing Conversion of units
- Unit (chemical engineering), a unit is a vessel or pipe in a chemical plant (see unit operation)[citation needed]
- Units (software), a cross-platform command-line computer program that does unit conversion
- Functional unit, a component of a computer system such as the CPU
- In blood transfusion, one unit of blood is equal to one pint
- Unit of alcohol, 10 millilitres of pure ethanol in the United Kingdom
- In a 19-inch rack a rack unit is a standard height of 1.75 inches (44 mm)
- In computer programming, unit testing is a method of testing that verifies the individual units of source code are working properly.
In entertainment and the arts: - UNIT - the Unified Intelligence Taskforce in Doctor Who
- Unit (album), an indie pop album by the Australian band Regurgitator
- G-Unit, a hip-hop music group
- The Units, a synthpunk band from San Francisco from 1978 to 1984
- The Unit, an American television series
- Second unit, a team that shoots footage which is of lesser importance for the final motion picture
- Unit of action, a discrete piece of action (or beat) in a theatrical presentation
- UNIT Post Production, a post production company, based in Soho, London
- Unit (art collective), a British artists' collective
In other uses: - Unit (housing), in Australia/New Zealand - a self-contained suite of rooms within a set of similar dwellings
- A unit, or apartment, can refer to a self-contained section of a building to be rented or otherwise occupied by a party
- Multiple unit, a passenger train whose carriages have their own motors
- Military units, including:
- Unit 101, an Israeli special operations unit
- Unit 731, a covert medical experiment unit of the Imperial Japanese Army
- Unit 1391, an Israeli torture facility
- Strategic business unit
- In real time strategy games, a unit describes an individual (or squad, depending on the game) infantry or vehicle
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