Crystallographic point group

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What Wikipedia says

In crystallography, a crystallographic point group is a point group whose symmetry operations are compatible with the translational symmetry of crystallographic lattices. According to the crystallographic restriction theorem, point groups may only contain one-, two-, three-, four- and sixfold rotational symmetries.

Excerpt from the Wikipedia article “Crystallographic point group”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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