Digonal antiprismatic symmetry

Digonal antiprismatic symmetry, also known as dappic symmmetry and notated (BC2×A1)/2, is a 3D spherical symmetry group. It is the symmetry group of the tetragonal disphenoid and is the digonal member of the family of antiprismatic symmetries. It occurs as a subsymmetry of tetrahedral, octahedral, and icosahedral symmetries.

Subgroups

 * (BC2+×A1)/2
 * K3+
 * K2×I
 * K2+×I
 * A1×I×I
 * I×I×I

Convex polytopes with (BC2×A1)/2 symmetry

 * Tetragonal disphenoid (noble)
 * Rectangular trapezoprism (isogonal)/Digonal scalenohedron (isotopic)