MU

Film and television

• Aries Mu, a character from the anime Saint Seiya
• Mu La Flaga, a character from the anime Mobile Suit Gundam SEED
• Monsters University, a 2013 animated film by Disney and Pixar
• ‘μ‘s’ is the name of the protagonist school idol group in the anime Love Live!

Gaming

• Mu Online, a 2003 online role-playing game
• Mu, an ancient civilization from Mega Man Star Force 2.

Music

• Mu chord, a type of chord
• Mu Performing Arts, an Asian-American theater company and taiko drumming ensemble
• MU (musician), Mutsumi Kanamori, a Japanese-British musician
• MU, musical group formed by Merrell Fankhauser and Jeff Cotton
• M.U. – The Best of Jethro Tull, a greatest hits album

Other media

• Miskatonic University, a fictional university in the works of H.P. Lovecraft
• MU Press, an independent comic book publisher

Businesses and brands

• Mu Dynamics, a company which makes hardware and software to test network services
• MU Press, an independent comic book publisher
• Isuzu MU Wizard, a compact sport/utility vehicle
• Micron Technology, Boise, Idaho, US, NASDAQ symbol
• China Eastern Airlines, Shanghai, China, IATA code

Other organizations

• Mothers' Union, a global Anglican women's organisation
• Musicians' Union (UK)

Mythical places

• Mu (lost continent), a mythical continent in the Pacific Ocean

Universities

Biology and medicine

• Mu phage, a bacteriophage of the family Myoviridae of double-stranded DNA non-enveloped contractile tail bacterial viruses
• Centimorgan, or "map unit", a unit of recombinant frequency in genetics
• Monitor unit (MU), a measure of absorbed dose from a linear accelerator in radiation therapy = 0.001 Gray

Chemistry

• Chemical potential, a form of potential energy that can be absorbed or released during a chemical reaction
• Bridging ligand, an atom that connects two or more metal centers in a complex (molecule)

Mathematics

• MU puzzle, a puzzle in the book Gödel, Escher, Bach
• Möbius function, a multiplicative function in number theory and combinatorics
• Degree of membership in a fuzzy set
• The standard measure function name in measure theory
• Complex cobordism, an extraordinary cohomology theory

Measurement

• Micro-, SI (metric) prefix denoting a factor of 10⁻⁶ (one millionth)
• Micrometre (deprecated as a single-character symbol)
• Million units of energy, a term used in India for a gigawatt-hour, see kilowatt-hour#Other energy-related units
• Mu (unit), a Chinese area also spelled "mou", approximately 0.066 hectares.

Physics

• Coefficient of friction, used to approximate the force of friction
• Deformation (mechanics), as the "unit" of strain
• Electron mobility, relating the drift of electrons to the applied electric field across a material
• Permeability (electromagnetism) coefficient, degree of magnetization of a material
• Muon, an elementary particle
• Standard gravitational parameter of a celestial body
• Reduced mass, the "effective" inertial mass appearing in the two-body problem
• Magnetic dipole moment, a measure of the strength of a system's net magnetic source
• Linear density, a measure of mass per unit of length
• Viscosity, the resistance of a fluid which is being deformed by stress
• Mu-metal, a nickel-iron alloy with high magnetic permeability
• Muonium, exotic atoms made up of an antimuon and an electron

Other uses in science and technology

• μ, in evolutionary algorithms, the population size from which in each generation λ offspring will generate
• Mu (rocket family), a Japanese rocket family launched between 1966 and 2006
• Multiple unit, self-propelled train carriages capable of coupling with other units of similar type
• Olympus mju (stylised as µ[mju:]), series of a compact cameras