Jisho

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Wikipedia definition
1. Em (Cyrillic)Em is a letter of the Cyrillic script. Em commonly represents the bilabial nasal consonant /m/, like the pronunciation of ⟨m⟩ in "him". It is derived from the Greek letter Mu (Μ μ). The Cyrillic letter Em looks very similar, and corresponds to the Latin letter M but, as with most Cyrillic letters, the lowercase form is simply a smaller version of the uppercase.
Read “Em (Cyrillic)” on English Wikipedia
Read “М” on Japanese Wikipedia
Read “Em (Cyrillic)” on DBpedia

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