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 prismatic symmetry, with 6 octagons, 6 tetragons, and 4 triangles for faces.