Excavated dodecahedron

The excavated dodecahedron is an isohedral deltahedron. It can be formed by excavating every face of the regular dodecahedron with a pentagonal pyramid. It is also a non-convex variant of the pentakis dodecahedron.

This polyhedron's triangles are coplanar in sets of 3, making it superficially identical to the ditrigonal icosahedron.