Small hecatonicosihecatonicosachoron

The small hecatonicosihecatonicosachoron, or shihi, is a nonconvex uniform polychoron that consists of 120 truncated dodecahedra and 120 truncated great dodecahedra. 2 of each join at each vertex.

It is the medial stage of the truncation series between a faceted hexacosichoron and its dual small stellated hecatonicosachoron, which makes it the bitruncation of both of these polychora.