gyration
rotation in a discrete subgroup of symmetries of the Euclidean plane such that the subgroup does not also contain a reflection symmetry whose axis passes through the center of rotational symmetry
en-GB/d͡ʒaɪˈɹeɪʃən/
en-US/d͡ʒaɪˈɹeɪʃən/
rotation in a discrete subgroup of symmetries of the Euclidean plane such that the subgroup does not also contain a reflection symmetry whose axis passes through the center of rotational symmetry