Frieze group 5 of 7, p2: Conway's spinning hop, point group 2, 2 operations per period, orbifold 22∞. The motif alternately upright and upside down, no mirror.
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: