Great icosahedron
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In geometry, the great icosahedron is one of four Kepler–Poinsot polyhedra, with Schläfli symbol {3,5⁄2} and Coxeter-Dynkin diagram of. It is composed of 20 intersecting triangular faces, having five triangles meeting at each vertex in a... Wikipedia
Faces by sides: 20
Face configuration: V(53)/2
Properties: Regular nonconvex deltahedron
Schläfli symbol: 3,5⁄2
Stellation core: icosahedron
Symmetry group: Ih, H3,, (*532)
Wythoff symbol: 5⁄2 | 2 3