Retroditrigonary hecatonicosidishecatonicosachoron

The retroditrigonary hecatonicosidishecatonicosachoron, or ridthidy, is a nonconvex uniform polychoron that consists of 120 rhombidodecadodecahedra, 120 great ditrigonal dodecicosidodecahedra, and 120 small ditrigonal dodecicosidodecahedra. Six of each join at each vertex.

Vertex coordinates
Its vertices are the same as those of its regiment colonel, the rectified small ditrigonary hexacosihecatonicosachoron.