Small diretrosnub prismatosnub octishexacosichoron

The small diretrosnub prismatosnub octishexacosichoron, or sadersapsox, is a nonconvex uniform polychoron that consists of 600 great icosahedra and 600 small stellated dodecahedra (some of which lie in the same hyperplanes, forming 600 compounds of one of each), 600 great dodecahedra and 600 icosahedra (forming 600 compounds of one of each), 4800 octahemioctahedra (forming 2400 compounds of two), 600 small ditrigonal dodecicosidodecahedra, 600 icosidodecadodecahedra, 600 small rhombicosidodecahedra, 600 truncated icosahedra, and 3600 pentagrammic prisms.

One great icosahedron and one small stellated dodecahedron (two compounds), one great dodecahedron and one icosahedron (two compounds), eight octahemioctahedra (eight compounds), five small ditrigonal dodecicosidodecahedra, five icosidodecadodecahedra, five small rhombicosidodecahedra, five truncated icosahedra, and five pentagrammic prisms join at each vertex.

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

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