Small retrosnub icosicosahedron

The small retrosnub icosicosahedron, sirsei, or compound of five great icosahedra is a uniform polyhedron compound. It consists of 100 triangles (20 pairs of which form hexagrams due to following in the same plane), with five faces joining at a vertex.

It can be formed from the pentagrammatic snub psuedicosicosahedron by replacing each small stellated dodecahedron with the great icosahedron with which it shares its edges.