Small invertifrustary tetrishecatonicosihexacosichoron

The small invertifrustary tetrishecatonicosihexacosichoron, or sifuthix, is a nonconvex uniform polychoron that consists of 120 dodecadodecahedra, 600 octahedra, 120 great dodecicosidodecahedra, 120 small dodecicosidodecahedra, and 120 quasitruncated dodecadodecahedra. One dodecadodecahedron, one octahedron, two great dodecicosidodecahedra, two small dodecicosidodecahedra, and four quasitruncated dodecadodecahedra join at each vertex.

Vertex coordinates
Its vertices are the same as those of its regiment colonel, the antifrustary hexacositrishecatonicosachoron.