Small spinohecatonicosidishexacosichoron

The small spinohecatonicosidishexacosichoron, or sanhiddix, is a nonconvex uniform polychoron that consists of 600 tetrahedra, 600 truncated tetrahedra, and 120 small dodecicosahedra. One tetrahedron, three truncated tetrahedra, and three small dodecicosahedra join at each vertex.

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