Pentagonal retroprismatoverted hexacosihecatonicosachoron

The pentagonal retroprismatoverted hexacosihecatonicosachoron, or prap vixhi, is a nonconvex uniform polychoron that consists of 120 regular icosahedra and 600 truncated tetrahedra. 2 icosahedra and 10 truncated tetrahedra join at each vertex.

It is in the same regiment as the rectified great stellated hecatonicosachoron.