Pentachoron
four-dimensional analogue of the tetrahedron
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.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d8/5-cell.gif/220px-5-cell.gif)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/f5/Stereographic_polytope_5cell.png/220px-Stereographic_polytope_5cell.png)
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