18-5 gyrochoron

The 18-5 gyrochoron, also known as the triswirl 18, is a convex isochoric polychoron with 18 metabitruncated elongated gyrobifastigia as cells. Together with its dual, it is the fifth in an infinite family of triangular dihedral swirlchora and the third in an infinite series of hexagonal dihedral swirlchora.