8-simplex
CONVEX REGULAR 8-POLYTOPE
Enneazetton; 0 70 polytope; Ennea-8-tope
In geometry, an 8-simplex is a self-dual regular 8-polytope. It has 9 vertices, 36 edges, 84 triangle faces, 126 tetrahedral cells, 126 5-cell 4-faces, 84 5-simplex 5-faces, 36 6-simplex 6-faces, and 9 7-simplex 7-faces.