 The word unit means any of several things: ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ - Unit of measurement or physical unit, a fundamental quantity of measurement in science or engineering.
- Units (computer program), a popular program that does unit conversion.
- Functional unit, a component of a computer system such as the CPU.
- 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, a rock and roll album by the Australian band Regurgitator.
- Unit of alcohol, 10 millilitres of pure ethanol in the UK.
- In currency, a unit of money (a monetary unit).
- In a 19-inch rack a rack unit is a standard height of 1.75 inches.
- 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.
- In category theory, there is a natural transformation called the unit from the identity functor to the composition of two adjoint functors, q.v.
- Military units, including:
- Unit 101, an Israeli special operations unit.
- Unit 731, a secret unit of the Japanese army.
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