Wythoff symbol

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In geometry, the Wythoff symbol is a notation representing a Wythoff construction of a uniform polyhedron or plane tiling within a Schwarz triangle. It was first used by Coxeter, Longuet-Higgins and Miller in their enumeration of the uniform polyhedra.

Excerpt from the Wikipedia article “Wythoff symbol”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Parcly Taxel, Public domain, via Wikimedia Commons.