Topic summary
Mu (letter)
Mu (; uppercase Μ, lowercase μ; Ancient Greekμῦ, Greek: μι or μυ—both ) is the 12th letter of the Greek alphabet, representing the voiced bilabial nasalIPA:. In the system of Greek numerals it has a value of 40. Mu was derived from the Egyptian hieroglyphic symbol for water, which had been simplified by the Phoenicians and named after their word for water, to become the letter mem (𐤌). Letters that derive from mu include the Latin M and the Cyrillic М, though the lowercase resembles a small Latin U (u).