Mu

**Mu** can be:

*Mu, **Μ** or **μ**, a letter in the Greek alphabet.
μ is used as a symbol for:
**The SI prefix *micro*, meaning a factor of 10-6 (one millionth).
***μ by itself is often used as the "unit" of strain, though in this context it retains its SI prefix meaning, which is interchangeable with "x 10-6" or "ppm" (parts per million).
***μ by itself is an abbreviation for the unit micron. Both the term and the abbreviation should not be used. The preferred terms are µm and micrometre
**In mathematics,
***The arithmetic mean of a statistical population
***The Möbius function
***The least-fixed-point-operator
***A degree of membership from a fuzzy set.
**In chemistry,
***The chemical potential
**In physics, 
***The coefficient of friction
***The mobility coefficient
***The permeability (electromagnetism) coefficient
***The muon, an elementary particle
***The standard gravitational parameter
***The magnetic dipole moment
***The linear density
***Viscosity
***Reduced mass
**µTorrent, a freeware BitTorrent client for Microsoft Windows written in C++.
**μZiq, An alias of Mike Paradinas. 

**In Asian languages**:
*Mù, (穆), a Chinese surname
*Mu (unit of area) (亩/畝), a Chinese unit of area
*Mu (kana), represented by the Japanese kana む or ム
*Mu (negative) (無), a Japanese word important in Zen koan practice

**Mu** may also refer to:
*Muonium's atomic symbol 
*Mu-metal, an alloy used for screening magnetic fields
*Mu (lost continent), a mythical continent in the Pacific Ocean subsequently appearing in several books, films, and games
*Mu (rocket), a Japanese rocket
*Mu Dan, Chinese poet and translator
*Mu Online, an online role-playing game
*Mu La Flaga, a character from the anime *Mobile Suit Gundam SEED*
*Aries Mu, a character from the cartoon Saint Seiya
*Groupe Mu, an interdisciplinary Belgian group focusing on linguistics and rhetoric
*Lemuria, a hypothetical lost continent

**MU** may stand for:
*Mauritius' ISO 3166-1 alpha-2 country code
*China Eastern Airlines's IATA code
*Manchester United Football club
*The Mothers' Union, global Anglican women's organisation
*Monitor unit, a unit used in radiation therapy
*Centimorgan or "map unit", a unit of recombinant frequency in genetics
*Multiple unit, such as a rail diesel car
*MU puzzle, a puzzle in *Gödel, Escher, Bach*
*University of Mumbai, formerly called the University of Bombay
*Marquette University
*Marshall University
*Miami University, a public university in Oxford, Ohio
*Millersville University of Pennsylvania
*Miskatonic University 
*University of Missouri, a public university in Columbia, Missouri 
*Mahidol University, a University in Thailand
*Manipal University, a university in Karnataka, India
*MU (70's band), an early 1970s psychedelic group led by Merrell Fankhauser and Jeff Cotton
*MU (00's band), a 00's electro-punk group made up of producer Maurice Fulton and his wife Mutsumi Kanamori.
*Mirror Universe (Star Trek), fictional parallel universe in which the plots of several Star Trek television episodes take place
*Magic-User, a class type in D&D, HackMaster, and many fantasy RPGs
* Musician, an enlisted rating in the United States Navy
* Isuzu MU Wizard
* Micron Technology