20-4 gyrochoron

The 20-4 gyrochoron, also known as the pentagon tetracoil, is a convex isochoric polychoron and member of the gyrochoron family with 20 ridge-ditruncated tetragonal antiwedges as cells.

Each cell of this polychoron has mirror symmetry, with 2 octagons, 4 tetragons, and 4 triangles for faces.