Small dispinosnub prismatosnubdisnub hexishexacosichoron

The small dispinosnub prismatosnubdisnub hexishexacosichoron, or sednasposidshox, is a nonconvex uniform polychoron that consists of 600 small stellated dodecahedra, 1200 great dodecahedra (some of which lie in the same hyperplanes, forming 600 pentagonal retrosnub pseudodisoctahedra), 4800 cubohemioctahedra (forming 2400 compounds of two), 600 truncated icosahedra, 600 icosidodecadodecahedra, 600 small ditrigonal dodecicosidodecahedra, 3600 pentagrammic prisms, and 6000 triangular prisms.

One small stellated dodecahedron, two great dodecahedra (two compounds), eight cubohemioctahedra (eight compounds), five truncated icosahedra, five icosidodecadodecahedra, five small ditrigonal dodecicosidodecahedra, five pentagrammic prisms, and five triangular prisms join at each vertex.

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