D2, which is isomorphic to the Klein four-group, is the symmetry group of a non-equilateral rectangle. This figure has four symmetry operations: the identity operation, one twofold axis of rotation, and two nonequivalent mirror planes.
d2 which is isomorphic to the klein four-group is the symmetry group of a non-equilateral rectangle this figure has four symmetry operations the identity operation one twofold axis of rotation and two nonequivalent mirror planes