Great retrofrustary hexacositrishecatonicosachoron

The great retrofrustary hexacositrishecatonicosachoron, or girfixthi, is a nonconvex uniform polychoron that consists of 600 octahedra, 120 dodecadodecahedra, 120 great icosicosidodecahedra, and 120 small icosicosidodecahedra. 1 octahedron, 1 dodecadodecahedron, 2 great icosicosidodecahedra, and 2 small icosicosidodecahedra join at each vertex.

It is in the same regiment as the antifrustary hexacositrishecatonicosachoron.