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M, or m, is the thirteenth letter of the English alphabet.

M may also refer to:

Companies and products

• M (fragrance), a 2008 fragrance by Mariah Carey
• M-series rangefinder, a series of Leica camera models
• M (virtual assistant), a former virtual assistant in Facebook Messenger
• Macy's, Inc. (NYSE: M), an American department store chain
• Mercedes-Benz M-Class
• Miracle Mart, a Canadian department store known simply as "M" from 1986 to 1992
• Android M, a code name for the Android Marshmallow operating system
• BMW M, a subsidiary of car manufacturer BMW
• Farmall M, a tractor produced by International Harvester from 1939 to 1952
• Infiniti M, a line of cars

Numbers and units of measurement

• metre, symbol m
• mile (abbr.)
• nautical mile
• milli-, SI prefix m
• 1000 (number), Roman numeral M
• mega-, SI prefix M
• million (abbr.)
• minute, symbol m

Postal codes

• M, the postal code letter for Toronto in Canada
• M postcode area, a group of several postcode districts in Greater Manchester

Science and technology

• M (videocassette format), an obsolete recording format
• M-theory, a proposed solution for problems in superstring theories
• M band, radio frequencies from 60 to 100 GHz
• Mass (symbol m)
• Magnetic quantum number (symbol m)
• Messier object, in astronomy
• Metal (placeholder symbol M)
• Methionine, an alpha amino acid in biochemistry
• Molality (symbol m)
• Molar concentration, unit m
• Molar mass, (symbol M)
• ATC code M Musculo-skeletal system, a section of the Anatomical Therapeutic Chemical Classification System
• Seismic magnitude scales, various scales of magnitude using variations of M
• Slope, represented by variable m in a linear equation

Computing

• M or Wolfram Language, the programming language underlying Mathematica
• ".m", a MATLAB or GNU Octave file
• ".m", a Mathematica package
• ".m", an implementation file in Objective-C
• M, the MUMPS programming language
• M Sharp (programming language)
• M-code or just M, MATLAB programming language

Transportation

• Mu (rocket family), also known as M, a series of Japanese solid-fuelled carrier rockets
• Rapid transit, sometimes called "Metro" and shortened to an M.
• M, the prefix used for British motorways

Specific rail lines identified by the symbol "M"

• M (New York City Subway service)
• M Ocean View, San Francisco, U.S.
• Tokyo Metro Marunouchi Line, Tokyo Metro
• Midōsuji Line, Osaka Metro
• Honshi–Bisan Line, West Japan Railway Company

Entertainment

Characters

• M (Marvel Comics), a character associated with the X-Men universe
• M (James Bond), the codename of the fictional head of MI6
• Minoru Kokubunji (M), a Chobits anime character

Film and television

• M (1931 film), a German film directed by Fritz Lang
• M (1951 film), a remake of the previous, shifting the action from Berlin to Los Angeles
• M, a 2006 Japanese film directed by Ryūichi Hiroki
• M (2007 film), made in South Korea
• M (2018 Finnish film), a film directed by Anna Eriksson, loosely inspired by the last days of Marilyn Monroe
• M (2018 French film), a documentary film directed by Yolande Zauberman about child abuse in Bnei Brak
• M, an obsolete film rating in the American Motion Picture Association of America film rating system
• M, films recommended for mature audiences in the Australian Office of Film and Literature Classification
• M, the production code for the 1965 Doctor Who serial The Romans
• Manchete, a Brazilian television network from 1983 to 1999
• M. Son of the Century (miniseries), a 2024 television adaptation of M: Son of the Century

Print publications

• M (comic strip), a Norwegian comic strip
• M (John Cage book), a 1973 book by avant garde composer John Cage
• M (Peter Robb book), a 1998 book by Peter Robb about the Italian painter Caravaggio
• M (magazine), a monthly teenage magazine published by Bauer Media Group
• M: Son of the Century, a 2018 historical novel by Antonio Scurati

Video games

• M, short for Mature, a rating used by the Entertainment Software Rating Board to denote that a video game contains mature content

Music

Performers

• M (band), a British techno-pop project of the artist Robin Scott
• Matthieu Chedid, French singer (stage name "-M-")
• Lee Min-woo, Korean singer (stage name "M")
• Mem Nahadr, American singer and performance artist (stage name "M")

Albums

• M (John Abercrombie Quartet album), 1981
• M (Myrkur album), 2015
• M (Big Bang single album), 2015

Songs

• "M" (song), a 2000 song by Ayumi Hamasaki
• "M", a song by Chantal Kreviazuk from her album Colour Moving and Still
• "M", a song by The Cure from their 1980 album Seventeen Seconds
• "M", a song by Princess Princess from the 1989 album Diamonds
• "M's" (song), a 2015 song by ASAP Rocky

Other uses

• M Resort, a hotel-casino in Las Vegas, Nevada, U.S.
• M-Source, a hypothetical source document for the Gospel of Matthew
• Moderaterna, a Swedish political party
• Baby M, subject of a famous child custody battle
• m, the International Phonetic Alphabet symbol for a voiced bilabial nasal sound
• М, a letter of the Cyrillic alphabet
• M-ratio, a measure of the health of a player's chip stack in poker
• \m/, a common way of typing corna or devil's horns
• 'm, contraction of am, part of the English copular verb to be
• M, the symbol for the old German currency German gold mark
• m, the masculine grammatical gender
• m or M, the male gender
• M., the abbreviation for Monsieur
• M., the regnal year abbreviation for Mary I of England following her marriage to Philip II of Spain
• m., married
• m. or man., an abbreviation for the Azerbaijani manat (currency)
• m., short for measure (music), a segment of time corresponding to a specific number of beats
• 𝕸, the Masoretic Text, the authoritative Hebrew text of the Tanakh
• Mike, the military time zone code for UTC+12:00
• Honório de Freitas Guimarães (1902–1968), member of the Brazilian Communist Party

See also

• M series (disambiguation)
• M Train (disambiguation)
• Mister M (disambiguation)
• MU (disambiguation) (mu; Ancient Greek: Μ / Greek: μ)
• MM (disambiguation)

• Disambiguation pages