<P> A unit cube, more formally a cube of side 1, is a cube whose sides are 1 unit long . The volume of a 3 - dimensional unit cube is 1 cubic unit, and its total surface area is 6 square units . </P> <P> The term unit cube or unit hypercube is also used for hypercubes, or "cubes" in n - dimensional spaces, for values of n other than 3 and edge length 1 . </P>

A cube with a side length of blank unit is called a unit cube