four-dimensional analogue of the tetrahedron
(Redirected from 4-simplex)

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.

A pentachoron, rotating along two axes
A tube diagram