40-9 gyrochoron

The 40-9 gyrochoron, also known as the digonal double pentaswirltegum, is a convex isochoric polychoron with 40 identical cells. It is the fourth in an infinite family of isochoric digonal tegmatic swirlchora.

Each cell of this polychoron has chiral digonal symmetry, with 6 octagons, 6 tetragons, and 4 triangles for faces.