Great spinoretrosnub prismatosnub pentishexacosichoron

The great spinoretrosnub prismatosnub pentishexacosichoron, or gnarsapspox, is a nonconvex uniform polychoron that consists of 600 great icosahedra, 600 icosahedra and 600 great dodecahedra (falling into pairs in the same hyperplanes, forming 600 compounds of one of each), 2400 octahemioctahedra and 2400 cubohemioctahedra (forming 2400 compounds of one of each), 600 cuboctahedra (forming 120 antirhombicosicosahedra), 1200 great dodecicosahedra (forming 600 compounds of two), and 3600 pentagonal prisms.

One great icosahedron, one icosahedron and one great dodecahedron (two compounds), four octahemioctahedra and four cubohemioctahedra (eight compounds), one cuboctahedron (one compound), ten great dodecicosahedra (ten compounds), and five pentagonal prisms join at each vertex.

It can be obtained as the blend of 5 great dipentary dishecatonicosihexacosihecatonicosachora and 5 great dipentary hecatonicosiprismatohecatonicosihexacosichora. In the process, some of the octahemioctahedron and cubohemioctahedron cells blend out.

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