Mu is the 12th letter of the Greek alphabet. In the system of Greek numerals it has a value of Mu was derived from the Egyptian hieroglyphic symbol for water (𓈖), which . pronounced "music"; Used in the name of the school idol group μ's, pronounced " muse ", consisting of nine singing teen girls in the anime Love Live!. Definition: Eine Muse (lat. musa, griech. mousa= [Beschäftigung mit der] lebendig, ein Symbol "musi"-kalischer oder poetischer Eingebung?. "If a fish is the movement of water embodied, given shape, then cat is a diagram and pattern of subtle air."—Doris Lessing, English writer | Weitere Informationen.