Tri-icositetradiminished hexacosichoron

The tri-icositetradiminished hexacosichoron, tetragonal-antiwedge heptacontadichoron, tetragonal-antiwedge chirohexafold cubiswirlchoron, or tridex, is a noble polychoron with 72 bi-tridiminished icosahedra as cells. 9 cells join at each vertex. It can be obtained by diminishing the vertices of three icositetrachora from the hexacosichoron, and is the dual of the bi-icositetradiminished hexacosichoron.

The ratio between the longest and shortest edges is 1:$$\frac{1+\sqrt5}{2}$$ ≈ 1:1.61803.