Small tritrigonary prismatohecatonicosidishexacosichoron

The small tritrigonary prismatohecatonicosidishexacosichoron, or stut phiddix, is a nonconvex uniform polychoron that consists of 600 regular tetrahedra, 720 pentagrammic prisms, 600 cuboctahedra, and 120 small ditrigonary icosidodecahedra. 1 tetrahedron, 3 pentagrammic prisms, 3 cuboctahedra, and 1 small ditrigonary icosidodecahedron join at each vertex.

It can be constructed from the small ditetrahedronary hexacosihecatonicosachoron by expanding its small ditrigonary icosidodecahedral cells outward.

The small tritrigonary prismatohecatonicosidishexacosichoron contains the vertices of an inscribed great rhombicosidodecahedral prism.