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 n ...

s * N, the field norm * N for ''nullae'', a rare Roman numeral for zero * n, the size of a

statistical sample In statistics, quality assurance, and survey methodology, sampling is the selection of a subset (a statistical sample) of individuals from within a statistical population to estimate characteristics of the whole population. Statisticians attempt ...

Science

* N for

Newton (unit) The newton (symbol: N) is the unit of force in the International System of Units (SI). It is defined as 1 kg⋅m/s, the force which gives a mass of 1 kilogram an acceleration of 1 metre per second per second. It is named after Isaac Newton in ...

, the SI derived unit of force * N or

F_n

, a normal force 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) 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, 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 Unit of measurement, units of tim ...

, 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, the first of a set of quantum numbers of an atomic orbital * n, an electron density, the measure of the probability of an electron being present at a specific location * n, an

amount of substance In chemistry, the amount of substance ''n'' in a given sample of matter is defined as the quantity or number of discrete atomic-scale particles in it divided by the Avogadro constant ''N''A. The particles or entities may be molecules, atoms, ions, ...

in chemical physics * n, the coordination number of a substance * ''n-'', a lowercase prefix in chemistry denoting the straight-chain form of an

open-chain compound In chemistry, an open-chain compound (also spelled as open chain compound) or acyclic compound (Greek prefix "α", ''without'' and "κύκλος", ''cycle'') is a compound with a linear structure, rather than a cyclic one. An open-chain compound ha ...

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 atoms have been replaced by a substituen ...

s * ATC code N ''Nervous system'', a section of the Anatomical Therapeutic Chemical Classification System * Haplogroup N (mtDNA), a human mitochondrial DNA haplogroup * Haplogroup N (Y-DNA), a human Y-chromosome DNA haplogroup * N band, an atmospheric transmission window in the mid-infrared centred on 10 micrometres * N ray, a hypothesized form of radiation, found to be illusory *N., abbreviation of the Latin word ''nervus'' meaning

nerve A nerve is an enclosed, cable-like bundle of nerve fibers (called axons) in the peripheral nervous system. A nerve transmits electrical impulses. It is the basic unit of the peripheral nervous system. A nerve provides a common pathway for the e ...

, used in anatomy, e.g. N. vagus

Engineering

* N, in geotechnical engineering, the result of a standard penetration test * N, in electrical systems, the connection to neutral * N, an ITU prefix allocated to the United States for radio and television stations * n (Poland), 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 Pau ...

, a threaded RF connector for joining coaxial cables

Entertainment

* ''N.'' (novella), a 2008 short story by Stephen King * Near (Death Note) (alias ''N''), a character in the manga series ''Death Note'' * ''N'' (video game), a 2005 computer game * N (Pokémon), the leader and king of crime syndicate Team Plasma in the ''Pokémon'' franchise * The N, a block on the Noggin 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 ''"N" Is for Noose'' is the 14th novel in Sue Grafton's "Alphabet" series of mystery novels and features Kinsey Millhone, a private eye based in Santa Teresa, California, although much of this novel's action takes place elsewhere in California. ...

'', the fourteenth novel in Sue Grafton's "Alphabet mystery" series, published in 1998

Music

* N (singer), 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 Mount Vernon Arts Lab is a musical project of the Scottish musician Drew Mulholland, who has also recorded as Black Noise and N. Between 1996 and 2001, a string of EPs, singles, and albums were released. After this he continued to release mater ...

* ''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 Prov ...

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

Language

* , the

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

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 majorit ...

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 kan ...

, 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, d ...

, 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 (geometry), direction or geography. Etymology T ...

, 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 *

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 Boulevard ...

, a service of the New York City Subway * N Judah, a Muni Metro line in San Francisco, California * N (Los Angeles Railway), a line operated by the Los Angeles Railway from 1920 to 1950 *

N-class ferry N-class ferries are a class of RORO 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 in 2019 ...

, a class of small RORO ferry * N scale or N gauge, a popular model railway size * N, the identifier for the

knight (chess) The knight (♘, ♞) is a piece in the game of chess, represented by a horse's head and neck. It moves two squares vertically and one square horizontally, or two squares horizontally and one square vertically, jumping over other pieces. Each play ...

in algebraic notation *

November November is the eleventh and penultimate month of the year in the Julian and Gregorian Calendars, the fourth and last of four months to have a length of 30 days and the fifth and last of five months to have a length of fewer than 31 days. No ...

, the military time zone code for UTC−01:00