Small pentagonal retroprismatoverted dishecatonicosachoron

The small pentagonal retroprismatoverted dishecatonicosachoron, or sprapivady, is a nonconvex uniform polychoron that consists of 120 regular icosahedra and 120 truncated dodecahedra. 2 icosahedra and 10 truncated dodecahedra join at each vertex.

It is in the same regiment as the rectified hexacosichoron.