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Saurabh 1
Actually, this is an alternative term for renowned Hermann Mauguin Symbol. HM symbols are used to denote symmetry notations and it is widely accepted as it involves certain set of rules that are compatible with the real time symmetry operations. In abride one can say, Hermann-Mauguin (H-M) Symmetry Symbols are used to convey in a concise manner the symmetry of the 32 crystal classes. and the symbols for each class are given a specific name as a Point Group.