Wiktionary
dodecadodecahedron
n. (context geometry English) A nonconvex polyhedron with twenty-four faces, thirty vertices, and sixty edges.
Wikipedia
Dodecadodecahedron
In geometry, the dodecadodecahedron is a nonconvex uniform polyhedron, indexed as U. It is the rectification of the small stellated dodecahedron and the great dodecahedron.