Schläfli symbol

noun1

1. •
   A notation that recursively encodes certain properties of a specified regular polytope or tessellation.

   • The 24-cell has has 24 octahedral cells, 24 vertices, 96 triangular faces and 96 edges. Its Schläfli symbol is {3, 4, 3} from which we see that the vertex figure is a cube. — 2012