Icosahedron

An icosahedron (Greek: eikosaedron, from eikosi twenty + hedron seat; /ˌaɪ.kəʊ.sə.ˈhi.dɹən/; plural: -drons, -dra /-dɹə/) is any polyhedron having 20 faces, but usually a regular icosahedron is implied, which has equilateral triangles as faces.