Grand ditetrahedronary prismatohecatonicosihexacosichoron

The grand ditetrahedronary prismatohecatonicosihexacosichoron, or gadtaphix, is a nonconvex uniform polychoron that consists of 600 tetrahedra, 1200 triangular prisms, and 120 great rhombidodecahedra. Four tetrahedra, twelve triangular prisms, and twelve great rhombidodecahedra join at each vertex.

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