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 Mem . The letter Mu appears in conjunction with alpha and omega to signify the "beginning, middle (meson) and end", a phrase found in an Orphic verse describing Zeus. The lower-case letter mu is used as a special symbol in many academic fields.
In mathematics: the Möbius function in number theory, the integrating factor in ordinary differential equations, the population mean or expected value in probability and statistics
a measure in measure theory, minimalization in computability theory and recursion theory
In 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, linear density or mass per unit length in strings and other one-dimensional objects.
permeability in electromagnetism, dynamic viscosity in fluid mechanics, the amplification factor of a triode vacuum tube
In inorganic chemistry: the prefix given in IUPAC nomenclature for a bridging ligand.
In particle physics: the elementary particle called the muon
In Pharmacology: an important opiate receptor
In thermodynamics: the chemical potential of a system or component of a system.
In orbital mechanics: Standard gravitational parameter of a celestial body, the product of the gravitational constant G and the mass M.
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