Snub hexecontatetrasnub dishexadecachoron

The snub hexecontatetrasnub dishexadecachoron, or siggisdah, is a nonconvex uniform polychoron that consists of 16 great icosahedra, 16 icosahedra, 192 tetrahedra, and 64 octahedra. Two great icosahedra, two icosahedra, eight tetrahedra, and four octahedra join at each vertex.

It can be obtained as the blend of a snub hexecontatetrasnub-snub disoctachoron and a retroantiprismatosnub disicositetrachoron. In the process, all the cells of the former blend out, except for the tetrahedra and 64 of the octahedra.

Vertex coordinates
Its vertices are the same as those of its regiment colonel, the disnub disicositetrachoron.