1. <networking> The country code for Mauritius. 2. <philosophy> /moo/ The correct answer to the classic trick question "Have you stopped beating your wife yet?". Assuming that you have no wife or you have never beaten your wife, the answer "yes" is wrong because it implies that you used to beat your wife and then stopped, but "no" is worse because it suggests that you have one and are still beating her. According to various Discordians and Douglas Hofstadter the correct answer is usually "mu", a Japanese word alleged to mean "Your question cannot be answered because it depends on incorrect assumptions". Hackers tend to be sensitive to logical inadequacies in language, and many have adopted this suggestion with enthusiasm. The word "mu" is actually from Chinese, meaning "nothing"; it is used in mainstream Japanese in that sense, but native speakers do not recognise the Discordian question-denying use. It almost certainly derives from overgeneralisation of the answer in the following well-known Rinzei Zen teaching riddle: A monk asked Joshu, "Does a dog have the Buddha nature?" Joshu retorted, "Mu!" See also has the X nature, AI Koan. [Douglas Hofstadter, "Godel, Escher, Bach: An Eternal Golden Braid"]. [Jargon File] (2000-11-22)

<character> (Greek letter). 1. <unit> /micro/ prefix denoting division by 10^6, e.g. mu m (micrometre, a millionth part of a metre). Sometimes written as a 'u', the ASCII character nearest in appearance. 2. <mathematics> /myoo/ In the theory of functions, mu x . E denotes the least value of x for which E = x, i.e. the {least fixed point} of the function x . E. The recursive function mu f . H f satisfies (and is defined by) the equation mu f . H f = H (mu f . H f) An alternative notation for the same function is fix H = H (fix H) See fixed point combinator. 3. <database> multiple value. [Jargon File] (1995-10-30)

Mu is a mythical lost continent introduced by Augustus Le Plongeon, who used the "Land of Mu" as an alternative name for Atlantis. It was subsequently popularized as an alternative term for the hypothetical land of Lemuria by James Churchward, who asserted that Mu was located in the Pacific Ocean before its destruction.

The Mu, also known as M, was a series of Japanese solid-fueled carrier rockets, which were launched from Uchinoura between 1966 and 2006. Originally developed by Japan's Institute of Space and Astronautical Science, Mu rockets were later operated by Japan Aerospace Exploration Agency following ISAS becoming part of it.

King Mu of Baekje (580–641) (r. 600–641) was the 30th king of Baekje, one of the Three Kingdoms of Korea.

Mu Sheli (穆舍利), originally named Mu Yeli (穆邪利), nickname Huanghua (黃花), was an empress of the Chinese dynasty Northern Qi. She was Gao Wei's last empress.

The cuneiform sign mu, is a common-use sign of the Amarna letters, the Epic of Gilgamesh, and other cuneiform texts (for example Hittite texts). It is also used as MU.

Mu () is an ancient Korean word defining a shaman in the Korean traditional religion. Korean shamans hold rituals called gut (literally "good") for the welfare of the individuals and the society.

む, in hiragana, or ム in katakana, is one of the Japanese kana, which each represent one mora. The hiragana is written with three strokes, while the katakana is written with two.