# N (disambiguation)

For the Wikipedia guideline on notability requirements, see WP:N

N is the fourteenth letter of the Latin alphabet.

N or n may also refer to:

## Science

• N for Newton (unit), the SI derived unit of force
• N or ${\displaystyle F_{n}}$, a normal force in mechanics
• N, the chemical symbol for the element nitrogen
• 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, 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
• 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

## Entertainment

• N. (novella), a 2008 short story by Stephen King
• N (singer), stage name of Cha Hak-yeon, leader of the South Korean boy band VIXX
• Near (Death Note) (alias N), a character in the manga series Death Note
• 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 (video game), a 2005 computer game
• N, the leader and king of crime syndicate Team Plasma in the Pokémon franchise
• The N, a former name of American television network TeenNick

## Language

• [n̪], [n], [ɳ], [ɲ], [ŋ], [ɴ], symbols representing nasal consonants in the International Phonetic Alphabet
• N (kana), a Japanese kana
• Noun, a part of speech