Great diretrosnub disnub decahecatonicosadishexacosichoron

The great diretrosnub disnub decahecatonicosadishexacosichoron, or gadros daskydox, is a nonconvex uniform polychoron that consists of 1200 regular great icosahedra (falling in pairs in the same hyperplane, forming 600 small retrosnub disoctahedra), 4800 octahemioctahedra (also falling into the same plane, forming a compound of two octahemioctahedra), 4800 truncated tetrahedra (forming 2400 compounds of two truncated tetrahedra), and 1200 more truncated tetrahedra (forming 120 truncated icosicosahedra).

Two great icosahedra (two compounds), eight octahemioctahedra (eight compounds), and ten truncated tetrahedra (eight compounds of two, two compounds of ten) join at each vertex.

This polychoron can be obtained as the blend of 10 great dipentary hecatonicosidishexacosichora. In the process some of the octahemioctahedra blend out fully, while the other cells compound as noted above.

The great diretrosnub disnub decahecatonicosadishexacosichoron has been informally referred to as "Timmy", which originated from a story created by Jonathan Bowers in his website.