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 bilateral symmetry, with 2 mirror-symmetric octagons, 4 kites, and 4 isosceles triangles for faces.