Small dispinosnub snub prismatosnub pentishecatonicositetrishexacosichoron

The small dispinosnub snub prismatosnub pentishecatonicositetrishexacosichoron, or sidansos posphitux, is a nonconvex uniform polychoron that consists of 600 small stellated dodecahedra and 600 great icosahedra (some of which lie in the same hyperplanes, forming 600 compounds of one of each), 4800 cubohemioctahedra (forming 2400 compounds of two), 600 small dodecicosahedra, 600 small rhombidodecahedra, 3000 truncated tetrahedra (600 of which form 120 truncated chiricosahedra), and 3600 pentagrammic prisms.

One small stellated dodecahedron and one great icosahedron (two compounds), eight cubohemioctahedra (eight compounds), five small dodecicosahedra, five small rhombidodecahedra, five truncated tetrahedra (one compound, four single), and five pentagrammic prisms join at each vertex.

It can be obtained as the blend of 5 small dipentary hecatonicosiprismatohecatonicosihexacosichora and 5 small dipentary dishecatonicosidishexacosichora. In the process, some of the cubohemioctahedron cells blend out.

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