Triangular symmetry

Triangular symmetry, also known as triggic symmetry and notated as A2, is a 2D spherical Coxeter group. It is the symmetry group of the equilateral triangle, and has 3 rotation and 3 reflection elements.

Subgroups

 * A2+ (maximal)
 * A1×I (maximal)
 * I×I

Convex polytopes with A2 symmetry

 * Triangle (regular)
 * Ditrigon (isogonal)/Triambus (isotopic)