Zigzag

A zigzag is a regular apeirogon whose vertices are co-planar but not co-linear. It may be considered a skew polygon even though it is co-planar.

As a Petrie polygon
Zigzags appear as Petrie polygons of several polyhedra, in particular in Euclidean tilings, such as the triangular tiling, square tiling, and the hexagonal tiling. As a result they appear as faces of the Petrie duals of these polyhedra: the, Petrial triangular tiling, Petrial square tiling, and Petrial hexagonal tiling.