Frieze group 4 of 7, p11m: Conway's jump, point group m, 2 operations per period, orbifold ∞*. A row of letters and their reflection, as in still water.
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: