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This review describes the history of discovery of violation of spatial parity P, charge conjugation parity C, combined parity CP. The hypothesis of existence of mirror particles was called upon by its authors to restore the symmetry between left and right. The review presents the emergence and evolution of the concepts ``mirror particles'' and ``mirror matter''. It could serve as a concise guide to the ``mirror-land''. An important part of the review is the list of about 250 references with their titles.
L.B. Okun (Mon,) studied this question.