Retroinverted prismatohecatonicosachoron

The retroinverted prismatohecatonicosachoron, or ripahi, is a nonconvex uniform polychoron that consists of 120 great icosidodecahedra and 720 pentagrammic prisms. Five great icosidodecahedra and ten pentagrammic prisms join at each vertex.

It also has small stellated dodecahedra as pseudofacets.

Vertex coordinates
The vertices are the same as those of the regiment colonel, the rectified great faceted hexacosichoron.