Great disnub snub heptishexacosipentishecatonicosachoron

The great disnub snub heptishexacosipentishecatonicosachoron, or gidsoshexphi, is a nonconvex uniform polychoron that consists of 1200 great icosahedra (falling into pairs in the same hyperplanes, forming 600 small retrosnub disoctahedra), 600 icosahedra and 600 great dodecahedra (forming 600 compounds of one of each), 4800 cuboctahedra (forming 2400 compounds of two), 600 great rhombidodecahedra, 600 rhombidodecadodecahedra, 600 truncated great icosahedra, and 3000 truncated tetrahedra (600 of which form 120 truncated chiricosahedra).

Two great icosahedra (two compounds), one icosahedron and one great dodecahedron (two compounds), eight cuboctahedra (eight compounds), five great rhombidodecahedra, five rhombidodecadodecahedra, five truncated great icosahedra, and five truncated tetrahedra (one compound and four single) join at each vertex.

It can be obtained as the blend of 5 great dipentary hecatonicosihexacosidishecatonicosachora and 5 great dipentary hexacosihecatonicosihexacositrishecatonicosachora. In the process, some of the cuboctahedron cells blend out.

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