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 from the extended Schläfli symbol $$\{4,4\mid 4\}$$. 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
 * $$\left(\pm\frac{1}{2},\pm\frac{1}{2},\pm\frac{1}{2},\pm\frac{1}{2}\right)$$

Related polytopes
The square duocomb appears as the facet of the petrial tesseract, which is a regular skew polychoron.