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An '''icosahedron''' is any [[polyhedron]] with twenty [[face]]s.  In fact, the term is almost always used to refer specifically to a polyhedron with twenty [[triangle | triangular]] faces, and modifying words or alternate terminology are used to refer to other twenty-sided polyhedra, as in the case of the [[rhombic icosahedron]].

The [[regular icosahedron]] is one of the five [[Platonic solid]]s: its faces are all [[equilateral]] [[triangle]]s.  It has twenty [[vertex | vertices]] and thirty [[edge]]s.  Five faces meet at each vertex.  It is [[Platonic_Solid#Duality | dual]] to the [[regular dodecahedron]].

A soccer ball is an example of an icosahedron with the vertices flattened into pentagonal faces. 

==See Also==
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[[Category:Geometry]]
[[Category:Platonic solids]]