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

 * Chiral triangular symmetry (normal, maximal)
 * Reflection symmetry (maximal)
 * Identity symmetry (normal)

Convex polytopes with A2 symmetry

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