Small dispinosnub prismatosnub tetrishexacositrishexacosichoron

The small dispinosnub prismatosnub tetrishexacositrishexacosichoron, or sedanspostuxtix, 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), 600 great dodecahedra and 600 great icosahedra (forming 600 compounds of one of each), 4800 cubohemioctahedra (forming 2400 compounds of two), 600 truncated icosahedra, 600 small rhombidodecahedra, 600 small icosicosidodecahedra, and 3600 pentagrammic prisms.

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

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