20-3 gyrochoron

The 20-3 gyrochoron, also known as gyrus 20, is a convex isochoric polychoron and member of the gyrochoron family with 20 identical cells. It can also be constructed as the 20-7 gyrochoron. Together with its dual, it is the third in an infinite family of pentagonal dihedral swirlchora.

Each cell of this polychoron has mirror symmetry, with 2 dodecagons, 2 pentagons, 8 tetragons, and 2 triangles for faces.