Small dispinosnub prismatosnub trishexacositetrishexacosichoron

The small dispinosnub prismatosnub trishexacositetrishexacosichoron, or sidan spostixtux, is a nonconvex uniform polychoron that consists of 1200 small stellated dodecahedra (some of which lie in the same hyperplanes, forming 600 pentagrammatic snub pseudodisoctahedra), 1200 great dodecahedra (forming 600 pentagonal retrosnub pseudodisoctahedra), 4800 cubohemioctahedra (forming 2400 compounds of two), 600 truncated icosahedra, 600 icosidodecadodecahedra, 600 small rhombidodecahedra, and 3600 pentagrammic prisms.

Two small stellated dodecahedra (two compounds), two great dodecahedra (two compounds), eight cubohemioctahedra (eight compounds), five truncated icosahedra, five icosidodecadodecahedra, five small rhombidodecahedra, and five pentagrammic prisms join at each vertex.

It can be obtained as the blend of 5 small capped dipentary prismatohexacositrishecatonicosachora and 5 small capped dipentary hexacositetrishecatonicosachora. 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.