Pentachoron

In geometry a Pentachoron is an object in four-dimensional (4D) space. It is a regular polytope and a 4-simplex. It is also called hyperpyramid, 5-cell or pentatope. It has 5 cells (faces). Each cell is a tetrahedron.

Thumb — A pentachoron, rotating in just one plane

This short article about mathematics can be made longer. You can help Wikipedia by adding to it.