Editing Polyhedron (section)

===Number of faces===
Polyhedra may be classified and are often named according to the number of faces. The naming system is based on Classical Greek, and combines a prefix counting the faces with the suffix "hedron", meaning "base" or "seat" and referring to the faces. For example a [[tetrahedron]] is a polyhedron with four faces, a [[pentahedron]] is a polyhedron with five faces, a [[hexahedron]] is a polyhedron with six faces, etc.<ref>{{citation|title=The New Elements of Mathematics, Volume II: Algebra and Geometry|first=Charles S.|last=Peirce|author-link=Charles Sanders Peirce|editor-first=Carolyn|editor-last=Eisele|editor-link=Carolyn Eisele|year=1976|publisher=Mouton Publishers & Humanities Press|page=297|isbn=9783110818840 |url=https://books.google.com/books?id=Z3ldDwAAQBAJ&pg=PA297}}</ref> For a complete list of the Greek numeral prefixes see {{slink|Numeral prefix|Table of number prefixes in English}}, in the column for Greek cardinal numbers. The names of tetrahedra, hexahedra, octahedra (eight-sided polyhedra), dodecahedra (twelve-sided polyhedra), and icosahedra (twenty-sided polyhedra) are sometimes used without additional qualification to refer to the [[Platonic solid]]s, and sometimes used to refer more generally to polyhedra with the given number of sides without any assumption of symmetry.<ref>{{citation|orig-date=1996|year=2020|title=Crystal Structures: Patterns and Symmetry|first1=Michael|last1=O'Keefe|first2=Bruce G.|last2=Hyde|publisher=Dover Publications|page=134|isbn=9780486836546 |url=https://books.google.com/books?id=_MjPDwAAQBAJ&pg=PA134}}</ref>