Protriangular antiprismatic symmetry

Protriangular antiprismatic symmetry, also known as protrappic symmetry and notated as (G2+×A1)/2, is a 3D spherical symmetry group. It is the symmetry of the triangular antiprism if the bases are considered to have chiral rather than full triangular symmetry.

Subgroups

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

Convex polytopes with (G2+×A1)/2 symmetry

 * Triangular antiprism (isogonal)/Triangular antitegum (isotopic)