Cell 600

"The 600-cell is the finite regular four-dimensional polytope with Schläfli symbol {3,3,5). It is also known as the hypericosahedron or hexacosichoron. It is composed of 600 tetrahedra, with 5 to an edge. The 600-cell has 120 vertices (Coxeter 1969) and 720 edges. It is one of the six regular polychora."