Mu (letter)

twelfth letter of the Greek alphabet

Mu (uppercase/lowercase Μ μ) is a letter of the Greek alphabet used to represent the "m" sound in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 40. Letters that came from it include the Roman M and Cyrillic М.

In mathematics and statistics, the lowercase μ is used to represent population mean and the Möbius function.[1] It is also used to represent coefficient of friction, micrometre and muon in physics.[2]

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  1. "Greek/Hebrew/Latin-based Symbols in Mathematics". Math Vault. 2020-03-20. Retrieved 2020-10-06.
  2. "Mu Symbol in Greek Alphabet". Retrieved 2020-10-06.