Small rhombated grand hexacosichoron

The small rhombated grand hexacosichoron, or sirgax, is a nonconvex uniform polychoron that consists of 600 cuboctahedra, 720 pentagrammic prisms, and 120 great icosidodecahedra. 1 great icosidodecahedron, 2 pentagrammic prisms, and 2 cuboctahedra join at each vertex. It can be obtained by cantellating the grand hexacosichoron.

Related polychora
The small rhombated grand hexacosichoron is the colonel of a seven-member regiment. Its other members include the grand retrosphenoverted hecatonicosihexacosihecatonicosachoron, rhombic great hexacosihecatonicosachoron, pseudorhombic great dishecatonicosachoron, grand rhombic great hexacosihecatonicosachoron, great dishecatonicosintercepted hexacosihecatonicosachoron, and hecatonicosintercepted prismatohecatonicosihexacosichoron.