Square duocomb

The square duocomb is a regular skew polyhedron found within four-dimensional Euclidean space. It can be formed as the comb product of two squares, or the modified Schläfli symbol {4,4|4}. It has 16 square faces, 32 edges, and 16 vertices. It is a self-dual polyhedron.

Vertex coordinates
The square duocomb shares its vertices and edges with the tesseract, so its coordinates are
 * $$(\pm\frac{1}{2},\pm\frac{1}{2},\pm\frac{1}{2},\pm\frac{1}{2})$$