##### Wikipedia

**Proprism**

In geometry of 4 dimensions or higher, a **proprism** is a polytope resulting from the Cartesian product of two or more polytopes, each of two dimensions or higher. The term was coined by John Horton Conway for *product prism*. The dimension of the space of a proprism equals the sum of the dimensions of all its product elements.

More specific terms duoprism and triaprism represent the Cartesian product of two or three polytopes respectively.