MU

• Mu (letter) (uppercase: Μ; lowercase: μ), the Greek alphabet's 12th letter
• Mu (kana), む or ム, a Japanese kana
• Mu (cuneiform), a sign in cuneiform writing
• Mu (negative), a word meaning "no" or "without" (Japanese: 無; Korean: 무)
• Middle Ukrainian, Ukrainian language 16th-18th century
• Groupe μ, Belgian linguistics group

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" (pronounced "Muse") is the name of the protagonist school idol group in the anime series Love Live!
• Miss Universe, one of the Big Four international women's beauty pageants, founded in 1952

Literature

• MU Press (short for "Miscellanea Unlimited Press"; c. 1990-2006), a Seattle-based publisher of primarily "furry" comic books
• § Writers

Music

Albums

• Mu (album), a pair of free jazz albums by Don Cherry, released in 1969 and 1970
• Mu, an album by Jah Wobble
• M.U., The Best of Jethro Tull, a greatest hits album
• Mu Vol. I, an EP album by Richard Henshall, released in 2024, part of a trilogy

Music organizations

• Mu Performing Arts, an Asian-American theater company and taiko drumming ensemble
• MU, musical group formed by Merrell Fankhauser and Jeff Cotton
• Musicians' Union (United Kingdom)
• Planet Mu, an electronic music label

Other uses in music

• MU (musician), Mutsumi Kanamori, a Japanese-British musician
• MuseScore, a software GUI program for creating sheet music

Gaming

• Mu Online, a 2003 online role-playing game
• Mu, an ancient civilization from Mega Man Star Force 2
• Mu-12, a character from the BlazBlue series
• Colony Mu, a location from Xenoblade Chronicles 3

Computing and electronics

• /mu/, a board pertaining to music discussion on 4chan
• μ, in evolutionary algorithms, the population size from which in each generation λ offspring will generate
• .mu, the ccTLD of Mauritius
• Mu Dynamics, a Sunnyvale-based company that makes software and hardware for testing network services, owned by Spirent Communications plc
• Micron Technology (NASDAQ symbol MU), a Boise-based semiconductor company that manufactures computer memory and data storage products
• Olympus mju (stylised as μ[mju:]), series of a compact cameras

Physics

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

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)

Biology and medicine

• Bacteriophage Mu, a muvirus of the family Myoviridae of double-stranded DNA non-enveloped contractile tail bacterial viruses
• Map unit (m.u.) or centimorgan, 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
• SARS-CoV-2 Mu variant, one of the variants of SARS-CoV-2, the virus that causes COVID-19
• Mouse unit (MU), the amount of toxin required to kill a 20g mouse in 15 minutes via intraperitoneal injection

Measurement

• μ-/micro-, metric prefix denoting a factor of 10⁻⁶ (one millionth)
• Micrometre (deprecated as a single-character symbol "μ" for micron)
• Million units of energy, a term used in India for a gigawatt-hour; see Kilowatt-hour § Other related energy units
• Mu (land), a Chinese unit of area also spelled "mou", equivalent to about 0.066 hectares

Mathematics

• MU puzzle, from the Douglas Hofstadter book Gödel, Escher, Bach
• mu operator, a prefix operator μ that finds the minimum natural number that satisfies some predicate
• Möbius function μ(n), a multiplicative function in number theory and combinatorics
• Membership function (mathematics), μ_A, the m of a fuzzy set (U, m)
• Set function μ, in measure theory
• MU and μ, symbols relating to complex cobordism, an extraordinary cohomology theory
• Population mean (symbol μ)

Other uses in science and technology

• The mu (μ) ring of Uranus

• Mu (rocket family), a Japanese rocket family launched between 1966 and 2006
• China Eastern Airlines, Shanghai, China, IATA code
• Multiple unit, self-propelled train carriages capable of coupling with other units of similar type
• Isuzu MU, a compact sport/utility vehicle

Mythical places

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

Other places

• Mu River (Irrawaddy), a river in Burma (Myanmar)
• Mu River (Hokkaidō), a river in Japan
• Mù, a village in the Edolo municipality of Italy
• Mauritius (ISO 3166-1 alpha-2 country code MU)

• Mu (negative), 無, a concept in Buddhism
• Muism (Korean shamanism), the native religion of Korea
• Mu (shaman), a Korean priest
• Church of England in Hunters Hill, New South Wales, Australia ("early church code" used by NSW Registry of Births Deaths & Marriages)

• Mu (surname), a romanization of a Chinese family name: most commonly 穆, 牧, or 慕, but other possibilities include 木, 母 [Mǔ], 目, 沐, 睦 and 暮

Nobles and royals

• Mu family, a powerful Chinese family from the 14th to the 18th century
• Mu of Baekje (580-641), king of Baekje
• Mu of Balhae (died 737), king of Balhae from 718 to 737
• Marquis Mu of Cai, ruler of the state of Cai from 675 to 646 BC
• King Mu of Chu (died 614 BC), king of the state of Chu from 625 to 614 BC
• Emperor Mu of Jin (343-361), emperor of the Eastern Jin Dynasty
• Marquis Mu of Jin (died 812 BC), ruler of the state of Jin from c. 798 to 776 BC
• King Mu of Zhou (died 922 BC), king of the state of Zhou from c. 976 to 922 BC

Other people

• Athing Mu-Nikolayev (born 2002 as Mu), American middle-distance runner
• Mu Dan (1918-1977), Chinese poet and translator

• Metropolitan University (disambiguation)

Australia

• Macquarie University, Sydney, New South Wales
• Monash University, Melbourne, Victoria
• Murdoch University, Perth, Western Australia

India

• Madras University, Chennai
• Mumbai University
• Manipur University, Imphal

United States

Missouri

• Maryville University, Town and Country
• University of Missouri, Columbia

Pennsylvania

• Messiah University, Mechanicsburg
• Millersville University of Pennsylvania, Millersville

Other states

• Marquette University, Milwaukee, Wisconsin
• Marymount University, Arlington, Virginia
• Marshall University, Huntington, West Virginia

Asia and Oceania

• Mahidol University, Salaya, Thailand
• Mandalay University, Mandalay, Myanmar
• Meiho University, Pingtung, Taiwan
• Misamis University, Ozamiz City, Misamis Occidental, Philippines

Europe

• Masaryk University, Brno, Czech Republic
• Mondragon University, Mondragon, Spain

Africa

• Mzumbe University, Mzumbe, Tanzania

• Manchester United F.C., an English association football club (soccer team), initially named Newton Heath LYR Football Club (1878-1902)
• § Athletes

• Musician (United States Navy), an enlisted rating
• Mu, a type of icicle radish
• Mothers' Union, a global Anglican women's organisation