Small dispinosnub prismatodisnub trishexacosichoron

The small dispinosnub prismatodisnub trishexacosichoron, or sednispadistix, 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 dodecicosahedra, 600 rhombicosahedra, and 6000 triangular prisms.

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

It can be obtained as the blend of 5 small dipentary hexacosihecatonicosachora and 5 small dipentary hecatonicosiprismatohexacosihecatonicosachora. 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.