Schläfli symbol
For higher-dimensional regular polytopes, the Schläfli symbol is defined recursively as {"p"1, "p"2...,"p""n" − 1} if the facets have Schläfli symbol {"p"1,"p"2...,"p""n" − 2} and the vertex figures have Schläfli symbol {"p"2,"p"3...,"p""n" − 1}.