Small diretrosnub prismatosnubdisnub pentishexacosichoron

The small diretrosnub prismatosnubdisnub pentishexacosichoron, or sadersposidspox, is a nonconvex uniform polychoron that consists of 600 great icosahedra, 600 icosahedra, 4800 octahemioctahedra (some of which lie in the same hyperplanes, forming 2400 compounds of two), 600 small dodecicosahedra, 600 small dodecicosidodecahedra, 600 icosidodecadodecahedra, 3600 pentagrammic prisms, and 6000 triangular prisms.

One great icosahedron, one icosahedron, eight octahemioctahedra (eight compounds), five small dodecicosahedra, five small dodecicosidodecahedra, five icosidodecadodecahedra, five pentagrammic prisms, and five triangular prisms join at each vertex.

It can be obtained as the blend of 5 small dipentary dishecatonicosihexacosihecatonicosachora and 5 small dipentary disprismatohecatonicosihexacosihecatonicosachora. 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.