Grand ditetrahedronary retrodishecatonicosachoron

The grand ditetrahedronary retrodishecatonicosachoron, or gadtardy, is a nonconvex uniform polychoron that consists of 120 small ditrigonary icosidodecahedra and 120 great dodecicosidodecahedra. Four small ditrigonary icosidodecahedra and twelve great dodecicosidodecahedra join at each vertex.

Vertex coordinates
Its vertices are the same as those of its regiment colonel, the grand ditetrahedronary hexacosidishecatonicosachoron.