periodic rotational symmetry http://en.wikipedia.org/wiki/Rotational_symmetry rotational symmetry rotational symmetry rotational symmetry rotational symmetry drehsymmetrisch rotational symmetry axis of 180-degree symmetry rotational symmetry rotational symmetry rotational symmetry rotational symmetry rotational rotational symmetry rotational symmetry rotational symmetry English rotation symmetry rotational symmetry rotational symmetry rotational symmetry periodic rotational rotational symmetry symmetric as it rotates rotational symmetric rotational symmetry periodic English http://en.wikipedia.org/wiki/Rotational_symmetry Περιστροφής (Rotation) μετασχηματισμό της Περιστροφής (Rotation) rotational symmetry English en.wikipedia.org periodic periodic rotational symmetry periodic Rotational symmetry symmetry rotational symmetry rotational symmetry periodic rotational symmetry rotational symmetry Rotational symmetry Rotational symmetry periodic rotational symmetry periodic periodic rotational symmetry six-fold symmetry rotational symmetry periodic rotational symmetric rotational symmetry triskelion symmetric as it rotates rotational symmetry rotational symmetry rotational symmetry Rotational symmetry rotational symmetry 'Rotational symmetry rotational symmetry rotational symmetry rotational symmetry rotational symmetry rotational symmetry rotational symmetry "Rotational symmetry" rotation symmetry rotational symmetry rotational symmetry simetria rotacional rotational symmetry rotational symmetry Rotational symmetry rotational symmetry rotational symmetry rotational symmetry radial tilings rotational symmetry rotational symmetry whichever angle Rotational symmetry rotational symmetry http://en.wikipedia.org/wiki/Rotational_symmetry rotational symmetry periodic rotational rotational symmetry rotational symmetry rotational symmetry rotational symmetry cyclic (i.e., pure rotational) symmetry rotational symmetry English rotational symmetry rotational symmetry rotational symmetric rotational symmetry English periodic rotational symmetry Rotational symmetry http://en.wikipedia.org/wiki/Rotational_symmetry rotational symmetry rotational symmetry rotational symmetry Axisymmetric Rotational symmetry rotational symmetry symmetric as it rotates rotational symmetry radial tilings rotational symmetry rotationally symmetric. periodic