Octagonal retroprism

The octagonal retroprism, also called the octagonal crossed antiprism, is a prismatic isogonal polyhedron. It consists of 2 base octagons and 16 isosceles triangles. Each vertex joins one octagon and three triangles. It is a crossed antiprism based on an octagon, seen as a 8/7-gon rather than 8/1. It cannot be made uniform.

It is isomorphic to the octagonal antiprism.

Related polyhedra
There are an infinite amount of prismatic isogonal compounds that are the crossed antiprisms of compounds of octagons.