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.