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 teh 18-7 gyrochoron. Together with its dual, it is the fifth in an infinite family of triangular dihedral swirlchora and the second in an infinite series of hexagonal dihedral swirlchora.

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