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N (disambiguation)

Last updated March 07, 2026

N is the fourteenth letter of the English alphabet.

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

N for Newton (unit), the SI derived unit of force
N or $F_{n}$ , a normal force in mechanics
Nitrogen, symbol N, a chemical element
N or Asn, the symbol for the common natural amino acid asparagine
N, the Normality (chemistry) or chemical concentration of a solution
N, the neutron number, the number of neutrons in a nuclide
N, in Brillouin zone, the center of a face of a body-centered cubic lattice
N, the physical quantity "rotation" in the International System of Quantities
n, for nano-, prefix in the SI system of units denoting a factor of 10⁻⁹
n, the optical refractive index 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 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 contrast to its branched isomer
N-, an uppercase prefix in chemistry denoting that the substituent is bonded to the nitrogen, as in amines

N (New York City Subway service), 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
Tokyo Metro Namboku Line, a subway service operated by the Tokyo Metro, labeled
Nagahori Tsurumi-ryokuchi Line, a subway service operated by the Osaka Metro, labeled
Transilien Line N, a line of the Paris transport network
, the official West Japan Railway Company service symbol for the Akō Line

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 or N cell, a standard size of dry cell battery
N connector, a threaded RF connector for joining coaxial cables

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
"N" Is for Noose , the fourteenth novel in Sue Grafton's "Alphabet mystery" series, published in 1998
Serial Designation "N", one of the main characters from the web series Murder Drones (2021-2024)

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
N (album), a 2008 album by Norther
"N", a song by BanYa for the "Pump It Up: The Perfect Collection" music video game
"n", a song by iamamiwhoami

n, the International Phonetic Alphabet symbol for a voiced alveolar nasal sound
- n̪, n̼, n̥, ɳ, ɳ̊, ɲ, ɲ̊, ŋ, ŋ̊, ɴ, symbols representing other nasal consonants in the International Phonetic Alphabet
N (kana), a Japanese kana
Noun, a part of speech

Hyundai N, high performance brand of Hyundai Motor Company
N, North, one of the cardinal directions of the compass
N postcode area, the part of the London post town covering part of North London, England
₦, the symbol for the Nigerian naira currency
N, the code used to denote vehicle registration plates of Norway
N-class ferry, a class of small RORO ferry
N scale 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
Nachrichten-Abteilung, naval intelligence department of Imperial German