text: * Orbifold signature: 
  * Coxeter notation: [(&infin;,2),&infin;] or [&infin;,(2,&infin;)]
  * Lattice: rectangular
  * Point group: D
  * The group pg contains glide reflections only, and their axes are all parallel. There are no rotations or reflections.
  ;Examples of group pg
  Without the details inside the zigzag bands the mat is pmg; with the details but without the distinction between brown and black it is pgg.
  Ignoring the wavy borders of the tiles, the pavement is pgg.