Wallpaper group 3 of 17, pm: a rectangular lattice, point group m, 2 operations per cell, orbifold **. Written p1m1 in full.
Molecular point groups with their operations and character tables, the 230 space groups with a cell builder, and the 17 wallpaper and 7 frieze groups drawn live. The tool needs JavaScript, and WebGL2 for the 3D views; these are the pages it offers: