Small diretrosnub hexahexacosichoron

The small diretrosnub hexahexacosichoron, or sadroshax, is a nonconvex uniform polychoron that consists of 1200 great icosahedra (falling into the same plane to form 600 small retrosnub disoctahedra), 1200 regular icosahedra (falling into the same plane to form 600 snub disoctahedra), 4800 octahemioctahedra (falling into the same plane to form 2400 compounds of two), and 1200 small dodecicosahedra (falling into the same plane to form 600 compounds of two).

Two great icosahedra (two compounds), two icosahedra (two compounds), eight octahemioctahedra (eight compounds), and ten small dodecicosahedra (ten compounds) join at each vertex.

This polychoron can be obtained as the blend of 10 small dipentary dishecatonicosihexacosihecatonicosachora. In the process, some of the octahemioctahedron cells blend out.