Small ditrigonary trishecatonicosihexacosichoron

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

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