Small dispinosnub prismatosnub trishexacositrishexacosichoron

The small dispinosnub prismatosnub trishexacositrishexacosichoron, or sidan spistaxtix, 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, 4800 cubohemioctahedra (forming 2400 compounds of two), 600 small dodecicosahedra, 600 icosidodecadodecahedra, 600 small rhombidodecahedra, and 3600 pentagrammic prisms.

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

It can be obtained as the blend of 5 small dipentary hecatonicosiprismatohecatonicosihexacosichora 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.