Mu (letter)
Mu (upper case Μ, lower case μ) is the 12th letter of the Greek alphabet. In the system of Greek numerals it has a value of 40. In the ISO 8859 character encodings standard, it has an ordinal decimal value of 230. The lower-case letter μ is used as a special symbol in many academic fields. In mathematics:*the Möbius function in number theory*the population mean or expected value in probability and statistics*a measure in measure theoryIn measurement:*the SI prefix micro-, which represents one millionth, or 10−6*the micron, an old unit which corresponds to the micrometre (which is now denoted "µm") In classical physics and engineering:*the coefficient of friction*reduced mass in the two-body problem*permeability in electromagnetismIn particle physics:*the elementary particle called the muon Rarely, the letter μ may be used to distinguish one item represented by "m" from another (but a better option might be to use "m", "m", "m", etc.). Letters that arose from the Greek Μ include the Latin M and Cyrillic М.
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