Small snubretrosnub trishexacositetrishexacosichoron

The small snubretrosnub trishexacositetrishexacosichoron, or sosirstixtux, 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), 2400 octahemioctahedra and 2400 cuboctahedra (forming 2400 compounds of one of each), 600 cubohemioctahedra (forming 120 great antirhombicosahedra), 600 truncated icosahedra, 600 small dodecicosidodecahedra, 600 rhombidodecadodecahedra, and 600 small ditrigonal dodecicosidodecahedra.

One great icosahedron, one icosahedron and one great dodecahedron (two compounds), four octahemioctahedra and four cuboctahedra (eight compounds), one cubohemioctahedron (one compound), five truncated icosahedra, five small dodecicosidodecahedra, five rhombidodecadodecahedra, and five small ditrigonal dodecicosidodecahedra join at each vertex.

It can be obtained as the blend of 5 small dipentary dishecatonicosihexacosidishecatonicosachora and 5 small invertidipentary hecatonicosihexacosidishecatonicosachora. In the process, some of the octahemioctahedron and cuboctahedron cells blend out.

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