Schläfli Symbol

The symbol $\{p,q\}$ is used to denote a Tessellation of regular $p$-gons, with $q$ of them surrounding each Vertex. The Schläfli symbol can be used to describe Platonic Solids, and a generalized version describes Quasiregular Polyhedra and Archimedean Solids.

See also Archimedean Solid, Platonic Solid, Quasiregular Polyhedron, Tessellation