Great duoantiprism

The great duoantiprism or gudap, also known as the pentagonal-pentagrammic crossed duoantiprism or 5-5/3 duoantiprism, is a nonconvex uniform polychoron that consists of 10 pentagonal antiprisms, 10 pentagrammic crossed antiprisms and 50 tetrahedra obtained through the process of alternating a non-uniform 10-10/3 duoprism, whose decagrams have an edge length of ($\sqrt{5}$+1)/2 times that of its decagons. It and the hexadecachoron are the only uniform duoantiprisms.

The great duoantiprism can be vertex-inscribed into a small stellated hecatonicosachoron.