Mu
Mu or MU may refer to:
- mu (lowercase μ, uppercase Μ), a letter in the Greek alphabet
- Mu, a hypothetical lost continent in the Pacific Ocean
- mu (無), a Japanese word important in Zen koan practice
- mu (亩), Chinese unit of surface area, defined in modern times as one fifteenth of a hectare
- the IATA code for China Eastern Airlines
- Map unit (m.u.), used in genetics
- Mauritius (MU) ISO 3166-1 alpha-2 country code
- University of Missouri - Columbia (MU), "Missouri University"
- Marymount University, a small Catholic college in Arlington, VA
- Monitor unit (MU), a unit used in radiation therapy
- multiple unit (MU), such as a rail diesel car
- University of Mumbai (MU) formerly called the University of Bombay.
- Mu-metal, an alloy used for screening magnetic fields
- A MMORPG game Mu Online
- a Japanese rocket, Mu (rocket)
- the Isuzu MU, a 2-Door Sports 4WD released in Japan.
- the Mirror Universe (MU), the dark alternate universe of Star Trek.
The lower-case letter μ is used as a symbol for:
- The SI prefix micro.
- The micron, old name for micrometre (10−6 m).
- In physics, the friction coefficient, mobility, and mass per unit length. Mu nought (μ0) denotes the permeability of free space, which is exactly equal to 4π×10-7 NA-2.
- In electronics, the mutual gain of a vacuum tube.
- The arithmetic mean of a statistical population.
- mu is sometimes used to mean "the question contains an invalid assumption"