N is the fourteenth letter of the Latin alphabet. N or n may also refer to:

Mathematics

\mathbb

, the set of

natural number In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country"). Numbers used for counting are called ''cardinal ...

s * N, the

field norm In mathematics, the (field) norm is a particular mapping defined in field theory, which maps elements of a larger field into a subfield. Formal definition Let ''K'' be a field and ''L'' a finite extension (and hence an algebraic extension) of ''K ...

* N for ''nullae'', a rare Roman numeral for zero * n, the size of a statistical sample

Science

* N for Newton (unit), the SI derived unit of force * N or

F_n

, a

normal force In mechanics, the normal force F_n is the component of a contact force that is perpendicular to the surface that an object contacts, as in Figure 1. In this instance '' normal'' is used in the geometric sense and means perpendicular, as oppos ...

in mechanics *

Nitrogen Nitrogen is the chemical element with the symbol N and atomic number 7. Nitrogen is a nonmetal and the lightest member of group 15 of the periodic table, often called the pnictogens. It is a common element in the universe, estimated at se ...

, symbol N, a chemical element * N or Asn, the symbol for the common natural amino acid

asparagine Asparagine (symbol Asn or N) is an α-amino acid that is used in the biosynthesis of proteins. It contains an α-amino group (which is in the protonated −NH form under biological conditions), an α-carboxylic acid group (which is in the depro ...

* N, the

Normality (chemistry) In chemistry, the equivalent concentration or normality (N) of a solution is defined as the molar concentration ''ci'' divided by an equivalence factor ''f''eq: :Normality = Definition Normality is defined as the number of gramme or mole equi ...

or chemical concentration of a solution * ''N'', the

neutron number The neutron number, symbol ''N'', is the number of neutrons in a nuclide. Atomic number (proton number) plus neutron number equals mass number: . The difference between the neutron number and the atomic number is known as the neutron excess: . ...

, the number of neutrons in a nuclide * N, in

Brillouin zone In mathematics and solid state physics, the first Brillouin zone is a uniquely defined primitive cell in reciprocal space. In the same way the Bravais lattice is divided up into Wigner–Seitz cells in the real lattice, the reciprocal lattice ...

, the center of a face of a body-centered cubic lattice * n, for

nano- Nano (symbol n) is a unit prefix meaning "one billionth". Used primarily with the metric system, this prefix denotes a factor of 10−9 or . It is frequently encountered in science and electronics for prefixing units of time and length. ;Exam ...

, prefix in the SI system of units denoting a factor of 10⁻⁹ * n, the optical

refractive index In optics, the refractive index (or refraction index) of an optical medium is a dimensionless number that gives the indication of the light bending ability of that medium. The refractive index determines how much the path of light is bent, or ...

of a material * n, the

principal quantum number In quantum mechanics, the principal quantum number (symbolized ''n'') is one of four quantum numbers assigned to each electron in an atom to describe that electron's state. Its values are natural numbers (from 1) making it a discrete variable. A ...

, the first of a set of quantum numbers of an atomic orbital * n, an

electron density In quantum chemistry, electron density or electronic density is the measure of the probability of an electron being present at an infinitesimal element of space surrounding any given point. It is a scalar quantity depending upon three spatial va ...

, the measure of the probability of an electron being present at a specific location * n, an amount of substance in chemical physics * n, the

coordination number In chemistry, crystallography, and materials science, the coordination number, also called ligancy, of a central atom in a molecule or crystal is the number of atoms, molecules or ions bonded to it. The ion/molecule/atom surrounding the central io ...

of a substance * ''n-'', a lowercase prefix in chemistry denoting the straight-chain form of an open-chain compound in contrast to its branched isomer * ''N-'', an uppercase prefix in chemistry denoting that the substituent is bonded to the nitrogen, as in

amine In chemistry, amines (, ) are compounds and functional groups that contain a basic nitrogen atom with a lone pair. Amines are formally derivatives of ammonia (), wherein one or more hydrogen Hydrogen is the chemical element wi ...

s * ATC code N ''Nervous system'', a section of the Anatomical Therapeutic Chemical Classification System *

Haplogroup N (mtDNA) Haplogroup N is a human mitochondrial DNA (mtDNA) clade. A macrohaplogroup, its descendant lineages are distributed across many continents. Like its sibling macrohaplogroup M, macrohaplogroup N is a descendant of the haplogroup L3. All mtDNA ...

, a human mitochondrial DNA haplogroup *

Haplogroup N (Y-DNA) Haplogroup N (M231) is a Y-chromosome DNA haplogroup defined by the presence of the single-nucleotide polymorphism (SNP) marker M231. It is most commonly found in males originating from northern Eurasia. It also has been observed at lower fre ...

, a human Y-chromosome DNA haplogroup *

N band N, or n, is the fourteenth letter in the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''en'' (pronounced ), plural ''ens''. History ...

, an atmospheric transmission window in the mid-infrared centred on 10 micrometres *

N ray N-rays (or N rays) were a hypothesized form of radiation, described by French physicist Prosper-René Blondlot in 1903, and initially confirmed by others, but subsequently found to be illusory. History Context The N-ray affair occurred sho ...

, a hypothesized form of radiation, found to be illusory *N., abbreviation of the Latin word ''nervus'' meaning nerve, used in anatomy, e.g. N. vagus

Engineering

* N, in geotechnical engineering, the result of a

standard penetration test The standard penetration test (SPT) is an in-situ dynamic penetration test designed to provide information on the geotechnical engineering properties of soil. This test is the most frequently used subsurface exploration drilling test performed ...

* N, in electrical systems, the connection to neutral * N, an ITU prefix allocated to the United States for radio and television stations *

n (Poland) n was a Polish DTH platform. It was launched on October 12, 2006 and owned by ITI Neovision. On December 31, 2011 the company had reached 929,000 subscribers. On March 21, 2013, n was merged with Cyfra+ to form nc+. History In May 2006, t ...

, a digital TV platform *

N battery An N battery (or N cell) is a standard size of dry-cell battery. An N battery is cylindrical with electrical contacts on each end; the positive end has a bump on the top. The battery has a length of 30.2 mm and a diameter of 12.0 mm, ...

or N cell, a standard size of dry cell battery *

N connector The N connector (also, type-N connector) is a threaded, weatherproof, medium-size RF connector used to join coaxial cables. It was one of the first connectors capable of carrying microwave-frequency signals, and was invented in the 1940s by ...

, a threaded RF connector for joining coaxial cables

Entertainment

* ''N.'' (novella), a 2008 short story by Stephen King *

Near (Death Note) The manga series ''Death Note'' features an extensive cast of fictional characters designed by Takeshi Obata with their storylines created by Tsugumi Ohba."How to Think." ''Death Note: How to Read 13''. VIZ Media. 59. The story follows the nov ...

(alias ''N''), a character in the manga series ''Death Note'' * ''N'' (video game), a 2005 computer game *

N (Pokémon) N, or n, is the fourteenth letter in the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''en'' (pronounced ), plural ''ens''. History ...

, the leader and king of crime syndicate Team Plasma in the ''Pokémon'' franchise * The N, a block on the

Noggin Noggin may refer to: General * Noggin or gill (volume), a unit of volume * Noggin (cup), a small cup * Noggin, slang for head A head is the part of an organism which usually includes the ears, brain, forehead, cheeks, chin, eyes, nose, an ...

TV channel *N, the production code for the 1965 ''Doctor Who'' serial ''

The Web Planet ''The Web Planet'' is the fifth serial of the second season in the British science fiction television series ''Doctor Who''. Written by Bill Strutton and directed by Richard Martin, the serial was broadcast on BBC1 in six weekly parts from 1 ...

'' * '' "N" Is for Noose'', the fourteenth novel in Sue Grafton's "Alphabet mystery" series, published in 1998

Music

N (singer) Cha Hak-yeon (, born June 30, 1990), better known by his stage name N (), is a South Korean singer, actor, presenter, and radio host, signed to 51k. He debuted as a member of the South Korean boy group VIXX in May 2012, he began his acting car ...

, stage name of Cha Hak-yeon, leader of the South Korean boy band VIXX * N, an alias of Drew Mulholland, who recorded more often as Mount Vernon Arts Lab * ''N'' (album), a 2008 album by Norther * "N", a song by

BanYa Banya may refer to: Places Australia * Banya, Queensland, a locality in the Sunshine Coast Region, Queensland, Australia Bulgaria * Banya, Blagoevgrad Province, a thermal spa and mountain resort in southwest Bulgaria * Banya, Burgas P ...

for the "Pump It Up: The Perfect Collection" music video game * "n", a song by

iamamiwhoami iamamiwhoami ( ) is the electronic music and audiovisual project of Swedish singer-songwriter Jonna Lee in collaboration with her longtime record producer Claes Björklund. The project has, since 2009, released audiovisual series on their ch ...

Language

* , 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 standardized representation ...

symbol for a

voiced alveolar nasal The voiced alveolar nasal is a type of consonantal sound used in numerous spoken languages. The symbol in the International Phonetic Alphabet that represents dental, alveolar, and postalveolar nasals is , and the equivalent X-SAMPA symbol is ...

sound ** , , , , , , , , , , symbols representing other

nasal consonant In phonetics, a nasal, also called a nasal occlusive or nasal stop in contrast with an oral stop or nasalized consonant, is an occlusive consonant produced with a lowered velum, allowing air to escape freely through the nose. The vast major ...

s in the International Phonetic Alphabet *

N (kana) ん, in hiragana or ン in katakana, is one of the Japanese kana, which each represent one mora. ん is the only kana that does not end in a vowel sound (although in certain cases the vowel ending of kana, such as す, is unpronounced). The ka ...

, a Japanese kana *

Noun A noun () is a word that generally functions as the name of a specific object or set of objects, such as living creatures, places, actions, qualities, states of existence, or ideas.Example nouns for: * Living creatures (including people, alive, ...

, a part of speech

Other uses

* N,

North North is one of the four compass points or cardinal directions. It is the opposite of south and is perpendicular to east and west. ''North'' is a noun, adjective, or adverb indicating direction or geography. Etymology The word ''north ...

, one of the cardinal directions of the compass *

N postcode area N, or n, is the fourteenth letter in the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''en'' (pronounced ), plural ''ens''. History ...

, the part of the London post town covering part of North London, England * ₦, the symbol for the

Nigerian naira The naira (currency sign, sign: ₦; ISO 4217, code: NGN) is the currency of Nigeria. One naira is divided into 100 ''kobo''. The Central Bank of Nigeria (CBN) is the sole issuer of legal tender money throughout the Federal Republic of Nigeria ...

currency * N, the code used to denote

vehicle registration plates of Norway The registration plates of cars in Norway are maintained by the Norwegian Ministry of Transport and Communications. As in most countries, cars are identified only by number plates read visually. Each plate is a legal document that both identifies ...

N (New York City Subway service) The N Broadway Express is a rapid transit service in the B Division of the New York City Subway. Its route emblem, or "bullet", is colored , since it uses the BMT Broadway Line in Manhattan. The N operates at all times between Ditmars Boulevar ...

, a service of the New York City Subway *

N Judah The N Judah is a hybrid light rail/streetcar line of the Muni Metro system in San Francisco, California. The line is named after Judah Street that it runs along for much of its length, named after railroad engineer Theodore Judah. It links downt ...

, a Muni Metro line in San Francisco, California *

N (Los Angeles Railway) N was a streetcar line in Los Angeles, California. It was operated by the Los Angeles Railway from 1920 to 1950. The line ran from Spring and 2nd Streets to 8th Street and Western Avenue, by way of Spring Street, 9th Street, Vermont Avenue, and ...

, a line operated by the Los Angeles Railway from 1920 to 1950 *

N-class ferry N-class ferries are a class of RORO Ferry, ferries, of which one remaining example is owned by BC Ferries and has the distinction of being the smallest vessel in their fleet. The N class consists of four vessels: , sold to Mike Buttle Services i ...

, a class of small RORO ferry *

N scale N scale is a popular model railway scale. Depending upon the manufacturer (or country), the scale ranges from 1:148 to 1:160. In all cases, the ''gauge'' (the distance between the rails) is . The term N ''gauge'' refers to the track dimensions, ...

or N gauge, a popular model railway size * N, the identifier for the knight (chess) in algebraic notation * November, the military time zone code for UTC−01:00