Small dispinosnub tetrishexacosichoron

The small dispinosnub tetrishexacosichoron, or sidnostux, is a nonconvex uniform polychoron that consists of 600 great dodecahedra, 4800 cubohemioctahedra (some of which lie in the same hyperplanes, forming 2400 compounds of two), 600 truncated icosahedra, 600 small rhombidodecahedra, and 600 rhombicosahedra.

One great dodecahedron, eight cubohemioctahedra (eight compounds), five truncated icosahedra, five small rhombidodecahedra, and five rhombicosahedra join at each vertex.

It can be obtained as the blend of 5 small dipentary hexacosihecatonicosachora and 5 small spinobased dipentary hexacositrishecatonicosachora. 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.