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triakis icosahedron
In geometry, the triakis icosahedron (or kisicosahedron〔Conway, Symmetries of things, p.284〕) is an Archimedean dual solid, or a Catalan solid. Its dual is the truncated dodecahedron.
==Orthogonal projections==
The triakis icosahedron has three symmetry positions, two on vertices, and one on a midedge:
The Triakis icosahedron
has five special orthogonal projections, centered, on a vertex, on two types of edges, and two types of faces: hexagonal and pentagonal. The last two correspond to the A2 and H2 Coxeter planes.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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