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Schläfli symbol
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<p>In <a href="/facts/Geometry/wTQf5ffQ">geometry</a>, the Schläfli symbol is a notation of the form { p , q , r , . . . } {\displaystyle \{p,q,r,...\}} that defines <a href="/facts/List_of_regular_polytopes_and_compounds/Kng25Ymq">regular polytopes and tessellations</a>. </p><p>The Schläfli symbol is named after the 19th-century Swiss mathematician <a href="/facts/Ludwig_Schl%C3%A4fli/mszJDaFn">Ludwig Schläfli</a>,: 143 who generalized <a href="/facts/Euclidean_space/R2UbzmzM">Euclidean geometry</a> to more than three dimensions and discovered all their convex regular polytopes, including the six that occur in four dimensions. </p>