# Schläfli symbol

The Schläfli symbol is a notation, devised by Ludwig Schläfli,
which describes the number of edges of each polygon meeting at a vertex of a regular or semi-regular tiling or solid. For a Platonic
solid, it is written {*p*, *q*}, where *p* is the number
of sides each face has, and *q* is the number of faces that touch at
each vertex.