Grand ditrigonary trishecatonicosihexacosichoron

The grand ditrigonary trishecatonicosihexacosichoron, or gaddit thix, is a nonconvex uniform polychoron that consists of 600 octahedra, 120 icosidodecahedra, 120 great icosicosidodecahedra, and 120 rhombicosahedra. Three octahedra, three icosidodecahedra, six great icosicosidodecahedra, and six rhombicosahedra join at each vertex.

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