Small retrospinosnub heptishexacosichoron

The small retrospinosnub heptishexacosichoron, or sranishex, is a nonconvex uniform polychoron that consists of 600 great icosahedra, 1200 great dodecahedra (some of which lie in the same hyperplanes, forming 600 pentagonal retrosnub pseudodisoctahedra), 2400 octahemioctahedra and 2400 cubohemioctahedra (forming 2400 compounds of one of each), 600 cuboctahedra (forming 120 antirhombicosicosahedra), 600 icosidodecadodecahedra, 600 small ditrigonal dodecicosidodecahedra, 600 truncated icosahedra, and 600 small rhombidodecahedra.

One great icosahedron, two great dodecahedra (two compounds), four octahemioctahedra and four cubohemioctahedra (eight compounds), one cuboctahedron (one compound), five icosidodecadodecahedra, five small ditrigonal dodecicosidodecahedra, five truncated icosahedra, and five small rhombidodecahedra join at each vertex.

It can be obtained as the blend of 5 small dipentary trishecatonicosihecatonicosihexacosichora and 5 small spinobased dipentary hexacositrishecatonicosachora. In the process, some of the octahemioctahedron and cubohemioctahedron cells blend out.

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