13-3 gyrochoron

The 13-3 gyrochoron, also known as rocky 13, is a convex isochoric polychoron and member of the gyrochoron family with 13 identical cells. It can also be constructed as the 13-4 gyrochoron.

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