Mu (letter)

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. It is also used to represent coefficient of friction, micrometre and muon in physics.

 Related pages 
 Mu (unit of area)

 References 

Category:Greek alphabet