18-5 gyrochoron

The 18-5 gyrochoron, also known as the triswirl 18, is a convex isochoric polychoron and member of the gyrochoron family with 18 metabitruncated elongated gyrobifastigia as cells. It can also be constructed as the 18-7 gyrochoron.

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