20-5 gyrochoron

The 20-5 gyrochoron, also known as the square pentacoil, is a convex isochoric polychoron and member of the gyrochoron family with 20 ridge-truncated tetragonal antiwedges as cells.

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