Small disnub snub pentishecatonicosihexishexacosichoron

The small disnub snub pentishecatonicosihexishexacosichoron, or sidsosphihax, is a nonconvex uniform polychoron that consists of 600 great icosahedra, 600 icosahedra and 600 great dodecahedra (some of which lie in the same hyperplanes, forming 600 compounds of one of each), 4800 cuboctahedra (forming 2400 compounds of two), 600 small rhombidodecahedra, 600 rhombidodecadodecahedra, 600 small icosicosidodecahedra, and 3000 truncated tetrahedra (600 of which form 120 truncated chiricosahedra).

One great icosahedron, one icosahedron and one great dodecahedron (two compounds), eight cuboctahedra (eight compounds), five small rhombidodecahedra, five rhombidodecadodecahedra, five small icosicosidodecahedra, and five truncated tetrahedra (one compound and four single) join at each vertex.

It can be obtained as the blend of 5 small dipentary hecatonicosihexacosidishecatonicosachora and 5 small dipentary hecatonicosihexacosidishecatonicosihexacosichora.

Vertex coordinates
Its vertices are the same as those of its regiment colonel, the small diretrosnub disnub decahecatonicosadishexacosichoron.