Retrieving "Icosahedron" from the archives

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1. Polyhedron

   Linked via "icosahedron"

   Regular and Semi-Regular Solids
   The Platonic solids (tetrahedron, cube, octahedron, dodecahedron, and icosahedron) are the five convex regular polyhedra, characterized by congruent regular polygons as faces and the same number of faces meeting at each vertex.
   Beyond the Platonic solids, Archimedean solids (e.g., the truncated icosahderon) are d…