Rotation-inversion axis
[roh-tey-shuh n in-vur-zhuh n, -shuh n] /roʊˈteɪ ʃən ɪnˈvɜr ʒən, -ʃən/
noun, Crystallography.
1.
an axis of a crystal such that rotating about the axis and then inverting the crystal brings the crystal back to its original position.
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