Editing Unit (section)

==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#Chemical processes|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   <math>(\sqrt{-1})</math>
* [[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 round-off]], 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