18-3 gyrochoron

The 15-3 gyrochoron, also known as the hexagon tricoil, is a convex isochoric polychoron and member of the gyrochoron family with 18 ridge-tritruncated tetragonal antiwedges as cells.

Each cell of this polychoron has mirror symmetry, with 2 decagons, 6 tetragons, and 4 triangles for faces.