Small dispinosnub snub trishexacosipentishecatonicosachoron

The small dispinosnub snub trishexacosipentishecatonicosachoron, or sidansostixphi, is a nonconvex uniform polychoron that consists of 600 great icosahedra, 4800 cubohemioctahedra (some of which lie in the same hyperplanes, forming 2400 compounds of two), 600 small rhombidodecahedra, 600 rhombicosahedra, and 3000 truncated tetrahedra (600 of which form 120 truncated chiricosahedra).

One great icosahedron, eight cubohemioctahedra (eight compounds), five small rhombidodecahedra, five rhombicosahedra, and five truncated tetrahedra (one compound, four single) join at each vertex.

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