The Hermann-Mauguin symbols for point groups

The symmetry operators that characterise a point group are collected together into the point group symbol. Crystallographers use the International or Hermann-Mauguin symbols. [The alternative Schoenflies symbols are given in Appendix 3.] As in two-dimensions, the 

To determine the point group of an object, it is only necessary to write down a list of all of the symmetry elements that it posses, (not always easy), and then order them following the rules set out above. 

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