Retroditrigonary dishecatonicosachoron

The retroditrigonary dishecatonicosachoron, or ridditdy, is a nonconvex uniform polychoron that consists of 120 ditrigonary dodecadodecahedra and 120 rhombidodecadodecahedra. 2 ditrigonary dodecadodecahedra and 6 rhombidodecadodecahedra join at each vertex.

It is in the same regiment as the rectified small ditrigonary hexacosihecatonicosachoron.