Small tesseractitesseractihexadecachoron

The small tesseractitesseractihexadecachoron, or steth, is a nonconvex uniform polychoron that consists of 16 regular tetrahedra, 8 cubes, and 8 small cubicuboctahedra. 1 tetrahedron, 1 cube, and 3 small cubicuboctahedra join at each vertex.

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