M, or m, is the thirteenth letter of the English alphabet. M may also refer to:

Companies and products

M (fragrance) Mariah Carey ( ; born March 27, 1969) is an American singer-songwriter, record producer, and actress. Dubbed the "Honorific nicknames in popular music, Songbird Supreme" by ''Guinness World Records'', Carey is known for her five-octave voc ...

, 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) 1000 or one thousand is the natural number following 999 and preceding 1001. In most English-speaking countries, it can be written with or without a comma or sometimes a period separating the thousands digit: 1,000. A group of one thousan ...

, 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 1,000,000 (one million), or one thousand thousand, is the natural number following 999,999 and preceding 1,000,001. The word is derived from the early Italian ''millione'' (''milione'' in modern Italian), from ''mille'', "thousand", plus the ...

(abbr.) *

minute A minute is a unit of time defined as equal to 60 seconds. It is not a unit in the International System of Units (SI), but is accepted for use with SI. The SI symbol for minutes is min (without a dot). The prime symbol is also sometimes used i ...

, 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 The NATO M band is the obsolete designation given to the radio frequencies from 60 to 100 GHz (equivalent to wavelengths between 5 and 3 mm) during the cold war period. Since 1992 frequency allocations, allotment and assignments are in line to ...

, 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 In atomic physics, a magnetic quantum number is a quantum number used to distinguish quantum states of an electron or other particle according to its angular momentum along a given axis in space. The orbital magnetic quantum number ( or ) disting ...

(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 Methionine (symbol Met or M) () is an essential amino acid in humans. As the precursor of other non-essential amino acids such as cysteine and taurine, versatile compounds such as SAM-e, and the important antioxidant glutathione, methionine play ...

, an alpha amino acid in biochemistry *

Molality In chemistry, molality is a measure of the amount of solute in a solution relative to a given mass of solvent. This contrasts with the definition of '' molarity'' which is based on a given volume of solution. A commonly used unit for molality ...

(symbol ''m'') *

Molar concentration Molar concentration (also called molarity, amount concentration or substance concentration) is the number of moles of solute per liter of solution. Specifically, It is a measure of the concentration of a chemical species, in particular, of a so ...

, 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 In mathematics, the slope or gradient of a Line (mathematics), line is a number that describes the direction (geometry), direction of the line on a plane (geometry), plane. Often denoted by the letter ''m'', slope is calculated as the ratio of t ...

, represented by variable ''m'' in a linear equation

Computing

* M or

Wolfram Language The Wolfram Language ( ) is a proprietary, very high-level multi-paradigm programming language developed by Wolfram Research. It emphasizes symbolic computation, functional programming, and rule-based programming and can employ arbitrary stru ...

, the programming language underlying Mathematica * ".m", a

MATLAB MATLAB (an abbreviation of "MATrix LABoratory") is a proprietary multi-paradigm programming language and numeric computing environment developed by MathWorks. MATLAB allows matrix manipulations, plotting of functions and data, implementat ...

GNU Octave GNU Octave is a scientific programming language for scientific computing and numerical computation. Octave helps in solving linear and nonlinear problems numerically, and for performing other numerical experiments using a language that is mostly ...

file * ".m", a

Mathematica Wolfram (previously known as Mathematica and Wolfram Mathematica) is a software system with built-in libraries for several areas of technical computing that allows machine learning, statistics, symbolic computation, data manipulation, network ...

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,

programming language

Transportation

Mu (rocket family) The Mu, also known as M, was a series of Japanese Solid-fuel rocket, solid-fueled carrier rockets, which were launched from Uchinoura Space Center, Uchinoura between 1966 and 2006. Originally developed by Japan's Institute of Space and Astronauti ...

, 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 The is a Rapid transit, subway line in Tokyo, Japan, operated by Tokyo Metro. The line runs in a U-shape between Ogikubo Station in Suginami, Tokyo, Suginami and Ikebukuro Station in Toshima, Tokyo, Toshima, with a branch line between Nakano-Sa ...

, Tokyo Metro * Midōsuji Line, Osaka Metro * Honshi–Bisan Line, West Japan Railway Company

Entertainment

Characters

M (Marvel Comics) Penance (Monet Yvette Clarisse Maria Therese St. Croix) is a fiction, mutant Female superheroes, superheroine appearing in American comic books published by Marvel Comics. The character is primarily depicted in association with the X-Men. She w ...

, a character associated with the ''X-Men'' universe *

M (James Bond) M is a codename held by a fictional character in Ian Fleming's James Bond (literary character), James Bond book and James Bond filmography, film series; the character is the Chief of the Secret Intelligence Service for the agency known as MI6. ...

, 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 The Motion Picture Association film rating system is used in the United States and its territories to rate a motion picture's suitability for certain audiences based on its content. The system and the ratings applied to individual motion pictur ...

* 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 The Entertainment Software Rating Board (ESRB) is a self-regulatory organization that assigns age and content ratings to consumer video games in Canada, the United States, and Mexico. The ESRB was established in 1994 by the Entertainment Soft ...

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 ( ; ; pl. ; ; 1512, from Middle French , literally "my lord") is an honorific title that was used to refer to or address the eldest living brother of the king in the French royal court. It has now become the customary French title of respe ...

* M., the regnal year abbreviation for

Mary I of England Mary I (18 February 1516 – 17 November 1558), also known as Mary Tudor, was Queen of England and Ireland from July 1553 and Queen of Spain as the wife of King Philip II from January 1556 until her death in 1558. She made vigorous ...

following her marriage to Philip II of Spain * m.,

married Marriage, also called matrimony or wedlock, is a culturally and often legally recognised union between people called spouses. It establishes rights and obligations between them, as well as between them and their children (if any), and b ...

* m. or man., an abbreviation for the

Azerbaijani manat The manat (ISO 4217, ISO code: AZN; Currency symbol, sign: ₼; abbreviation: m) is the currency of Azerbaijan. It is subdivided into 100 ''gapiks''. The first iteration of the currency emerged in the Azerbaijan Democratic Republic and its succ ...

(currency) * m., short for measure (music), a segment of time corresponding to a specific number of beats * 𝕸, the

Masoretic Text The Masoretic Text (MT or 𝕸; ) is the authoritative Hebrew and Aramaic text of the 24 books of the Hebrew Bible (''Tanakh'') in Rabbinic Judaism. The Masoretic Text defines the Jewish canon and its precise letter-text, with its vocaliz ...

, 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

Companies and products

Numbers and units of measurement

Postal codes

Science and technology

Computing

Transportation

Specific rail lines identified by the symbol "M"

Entertainment

Characters

Film and television

Print publications

Video games

Music

Performers

Albums

Songs

Other uses

See also