Small dispinosnub prismatosnub hexacosidishexacosichoron

The small dispinosnub prismatosnub hexacosidishexacosichoron, or sedansposixdox, is a nonconvex uniform polychoron that consists of 600 icosahedra, 4800 cubohemioctahedra (some of which lie in the same hyperplanes, forming 2400 compounds of two), 600 small icosicosidodecahedra, 600 rhombicosahedra, and 3600 pentagrammic prisms.

One icosahedron, eight cubohemioctahedra (eight compounds), five small icosicosidodecahedra, five rhombicosahedra, and five pentagrammic prisms join at each vertex.

It can be obtained as the blend of 5 small dipentary hexacosihecatonicosachora and 5 small dipentary prismatohecatonicosihexacosihecatonicosachora. In the process, some of the cubohemioctahedron cells blend out.

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