Icosahedron n. : A solid bounded by twenty sides or faces.

Example:
How do i build a straw Icosahedron?

Taxonomy
icosahedron, regular icosahedron, edge, icosahedra, dodecahedron, edge length, tetrahedron, truncated icosahedron, adjacent vertices, equiangular lines, polyhedra, cells, regular polyhedron, the golden ratio, stellations, sphere, Great icosahedron, triakis icosahedron.

Defination from the web:
icosahedron (Greek: εικοσάεδρον, from eikosi twenty + hedron seat; pronounced /ˌaɪkɵsəˈhiːdrən/ or /aɪˌkɒsəˈhiːdrən/; plural: ... The regular icosahedron is one of the five Platonic solids. ...