Great octagonal spinoduoprism

The great octagonal spinoduoprism, or gondip, is a nonconvex uniform polychoron that consists of 64 regular tetrahedra, 128 triangular prisms, and 64 cubes. 2 tetrahedra, 6 triangular prisms, and 4 cubes join at each vertex.

It was discovered in March 2006, constructed as a blend of 4 quasidisprismatotesseractihexadecachora. Its vertex figure is in turn a blend of two vertex figures of the quasidisprismatotesseractihexadecachoron. It has the same symmetry as the octagonal duoprism.

Related polychora
The regiment of the great octagonal spinoduoprism contains one other uniform member (the great ditetragonal spinoduoprism), a fissary uniform member (the great ditetragonal fissary duoprism, and 10 scaliform members.