: Possible orders are 2, 3, 4, or 6 (180°, 120°, 90°, and 60°). Reflections : Mirror symmetry across an axis.
: Every wallpaper group must have translations in two independent directions. 1083x1431 Traditional Wallpaper Patterns Group ...
A "wallpaper group" is a mathematical classification system for two-dimensional repetitive patterns based on their symmetries. There are exactly that can tile a plane, a fact famously proven by Evgraf Fedorov and later George Pólya. The 17 Wallpaper Groups : Possible orders are 2, 3, 4, or
: A combination of a reflection and a translation along the mirror axis. Understanding the Notation (IUC) : Possible orders are 2