Small tritrigonary hecatonicosiprismatodishecatonicosihexacosichoron

The small tritrigonary hecatonicosiprismatodishecatonicosihexacosichoron, or sit thipdahix, is a nonconvex uniform polychoron that consists of 600 tetrahedra, 120 truncated icosahedra, 120 small rhombicosidodecahedra, 720 decagonal prisms, and 120 great rhombicosidodecahedra. One tetrahedron, three truncated icosahedra, three small rhombicosidodecahedra, six decagonal prisms, and six great rhombicosidodecahedra join at each vertex.

It also has compound of five cubes as pseudofacets.

Vertex coordinates
Its vertices are the same as those of its regiment colonel, the small tritrigonary prismatohecatonicosidishexacosichoron.