Small disnub prismatosnubdisnub pentishexacosichoron

The small disnub prismatosnubdisnub pentishexacosichoron, or sidsposidspox, is a nonconvex uniform polychoron that consists of 1200 great icosahedra (some of which lie in the same hyperplanes, forming 600 small retrosnub disoctahedra), 600 great dodecahedra, 4800 cuboctahedra (forming 2400 compounds of two), 600 truncated icosahedra, 600 small icosicosidodecahedra, 6000 triangular prisms, and 3600 pentagrammic prisms.

Two great icosahedra (two compounds), one great dodecahedron, eight cuboctahedra (eight compounds), five truncated icosahedra, five small icosicosidodecahedra, five triangular prisms, and five pentagrammic prisms join at each vertex.

It can be obtained as the blend of 5 small dipentary prismatohexacosihecatonicosachora and 5 small dipentary prismatohexacositetrishecatonicosachora.

Vertex coordinates
Its vertices are the same as those of its regiment colonel, the small diretrosnub disnub decahecatonicosadishexacosichoron.