voxel

A voxel, short for "volume pixel," is the smallest distinguishable box-shaped part of a three-dimensional image. It is the 3D conceptual counterpart of the 2D pixel.

Each voxel is a quantum unit of volume and has a numeric value (or values) associated with it that represents some measurable properties or independent variables of real objects or phenomena. It is the smallest distinguishable box-shaped element of a three-dimensional space. A particular voxel is identified by the x, y, and z coordinates of one of its eight corners, or perhaps its centre. The term is used in three-dimensional modeling and in the discussion of data cubes.