- Unit Of Measurement , a fundamental quantity of measurement
- Units (computer Program) , a popular program that does unit conversion
- Units Of Energy , the units for energy measurements
- Units Conversion By The Factor-label Method
- 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 , 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 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
- --- 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 '', Q.v.
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