ქიმიის ტერმინთა განმარტებითი ლექსიკონი

In spectroscopy, a rotation-reflection axis, which is a symmetry element such that rotation by 2π/n
about the axis followed by reflection through a plane perpendicular to the axis transforms an object into
itself.

Note: In crystallography, a rotation-inversion axis, which is a symmetry element such that rotation by
2π/n about the axis followed by inversion through the centre of symmetry transforms an object into
itself.