Small prismatohecatonicosidishecatonicosachoron

The small prismatohecatonicosidishecatonicosachoron, or siphidy, is a nonconvex uniform polychoron that consists of 720 pentagonal prisms, 120 truncated great dodecahedra, 120 icosidodecadodecahedra, and 120 great rhombicosidodecahedra. 1 pentagonal prism, 1 truncated great dodecahedron, 1 icosidodecadodecahedron, and 2 great rhombicosidodecahedra join at each vertex.

It is in the same regiment as the prismatorhombated great hecatonicosachoron.