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 The metre (or meter in US spelling; symbol: m) is the base unit of length in the International System of Units (SI). Since 2019, the metre has been defined as the length of the path travelled by light in vacuum during a time interval of of ...

, symbol m *

mile The mile, sometimes the international mile or statute mile to distinguish it from other miles, is a imperial unit, British imperial unit and United States customary unit of length; both are based on the older English unit of Unit of length, le ...

(abbr.) *

nautical mile A nautical mile is a unit of length used in air, marine, and space navigation, and for the definition of territorial waters. Historically, it was defined as the meridian arc length corresponding to one minute ( of a degree) of latitude at t ...

* milli-, SI prefix m * 1000 (number), Roman numeral M *

mega- Mega is a metric prefix, unit prefix in metric systems of units denoting a factor of one million (106 or 1000000 (number), ). It has the unit symbol M. It was confirmed for use in the International System of Units (SI) in 1960. ''Mega'' comes fro ...

, SI prefix M * million (abbr.) * minute, symbol m

Postal codes

* M, the postal code letter for

Toronto Toronto ( , locally pronounced or ) is the List of the largest municipalities in Canada by population, most populous city in Canada. It is the capital city of the Provinces and territories of Canada, Canadian province of Ontario. With a p ...

in Canada *

M postcode area The M postcode area, also known as the Manchester postcode area, is a group of Postcodes in the United Kingdom, postcode districts in the North West of England. The districts are subdivisions of three post towns: Manchester, Salford, and Sale, ...

, a group of several postcode districts in Greater Manchester

Science and technology

* M (videocassette format), an obsolete recording format *

M-theory In physics, M-theory is a theory that unifies all Consistency, consistent versions of superstring theory. Edward Witten first conjectured the existence of such a theory at a string theory conference at the University of Southern California in 1 ...

, a proposed solution for problems in superstring theories * M band, radio frequencies from 60 to 100 GHz *

Mass Mass is an Intrinsic and extrinsic properties, intrinsic property of a physical body, body. It was traditionally believed to be related to the physical quantity, quantity of matter in a body, until the discovery of the atom and particle physi ...

(symbol ''m'') * Magnetic quantum number (symbol ''m'') *

Messier object The Messier objects are a set of 110 astronomical objects catalogued by the French astronomer Charles Messier in his ' (''Catalogue of Nebulae and Star Clusters''). Because Messier was interested only in finding comets, he created a list of th ...

, in astronomy *

Metal A metal () is a material that, when polished or fractured, shows a lustrous appearance, and conducts electrical resistivity and conductivity, electricity and thermal conductivity, heat relatively well. These properties are all associated wit ...

(placeholder symbol M) * Methionine, an alpha amino acid in biochemistry * Molality (symbol ''m'') * Molar concentration, unit *

Molar mass In chemistry, the molar mass () (sometimes called molecular weight or formula weight, but see related quantities for usage) of a chemical substance ( element or compound) is defined as the ratio between the mass () and the amount of substance ...

, (symbol ''M'') * ATC code M ''Musculo-skeletal system'', a section of the Anatomical Therapeutic Chemical Classification System *

Seismic magnitude scales Seismic magnitude scales are used to describe the overall strength or "size" of an earthquake. These are distinguished from seismic intensity scales that categorize the intensity or severity of ground shaking (quaking) caused by an earthquake at ...

, 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 Objective-C is a high-level general-purpose, object-oriented programming language that adds Smalltalk-style message passing (messaging) to the C programming language. Originally developed by Brad Cox and Tom Love in the early 1980s, it was ...

* M, the

MUMPS MUMPS ("Massachusetts General Hospital Utility Multi-Programming System"), or M, is an imperative, high-level programming language with an integrated transaction processing key–value database. It was originally developed at Massachusetts Gen ...

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 Rapid transit or mass rapid transit (MRT) or heavy rail, commonly referred to as metro, is a type of high-capacity public transport that is generally built in urban areas. A grade separation, grade separated rapid transit line below ground su ...

, 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 * , the

International Phonetic Alphabet The International Phonetic Alphabet (IPA) is an alphabetic system of phonetic notation based primarily on the Latin script. It was devised by the International Phonetic Association in the late 19th century as a standard written representation ...

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 The German mark ( ; sign: ℳ︁) was the currency of the German Empire, which spanned from 1871 to 1918. The mark was paired with the minor unit of the pfennig (₰); 100 pfennigs were equivalent to 1 mark. The mark was on the gold stand ...

* m, the masculine

grammatical gender In linguistics, a grammatical gender system is a specific form of a noun class system, where nouns are assigned to gender categories that are often not related to the real-world qualities of the entities denoted by those nouns. In languages wit ...

* m or M, the

male Male (Planet symbols, symbol: ♂) is the sex of an organism that produces the gamete (sex cell) known as sperm, which fuses with the larger female gamete, or Egg cell, ovum, in the process of fertilisation. A male organism cannot sexual repro ...

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