NA, N.A., Na, nA or n/a may refer to:

Chemistry and physics

  • Sodium, symbol Na, a chemical element
  • Avogadro constant (N<sub>A</sub>)
  • Nucleophilic addition, a type of reaction in organic chemistry
  • Numerical aperture, a number that characterizes a range of angles in an optical system
  • nA, the symbol for nanoampere
  • Naturally aspirated engine

Biology and medicine

  • Na (tree) or Mesua ferrea, a species of tree native to Sri Lanka
  • Neuroacanthocytosis, a neurological condition
  • Nomina Anatomica, a former international standard for human anatomical nomenclature
  • Noradrenaline, a hormone
  • Nucleic acid analogue, compounds analogous to naturally occurring RNA and DNA

Places

Current

  • Namibia (ISO country code)
  • Naples (car number plate code: NA), Italy
  • North America, a continent
  • North Africa, a subcontinent

Historical

  • Netherlands Antilles (former international vehicle registration code: NA)
  • Na (Chinese state), a small state of the Chinese Zhou dynasty from the 11th to 8th centuries BC
  • Nakoku, or Na, a state in Kyūshū, Japan from the 1st to early 3rd centuries AD

Names and titles

  • Na (羅), a Korean surname related to the Chinese surname Luo
  • Na, a particle used in Thai noble names
  • National Academician, a member of the National Academy of Design

Art and entertainment

  • Na (drum), a drum played by Tibetan shamans
  • Nahal, Shine's pet Bengal tiger on the Nick Jr. TV show Shimmer and Shine
  • New adult fiction, fiction marketed to people 18–30 years old
  • Virgin New Adventures, a series of Doctor Who novels
  • Na (EP) by Nayeon, 2024

Transport

  • NA, the tailcode of VFA-94
  • Nepal Airlines, the national flag carrier airline of Nepal
  • North American Airlines (1990–2014, IATA code: NA)
  • National Airlines (1934–1980) (IATA code: NA)
  • Naturally aspirated engine
  • NA MX-5 Miata, the first generation of the Mazda Miata

Language

  • Na (cuneiform), a cuneiform sign
  • Na (Javanese) (ꦤ), a letter in the Javanese script
  • Na (kana), a Japanese kana
  • Na dialect, a Sino-Tibetan variety of India
  • Na language (Narua), a Sino-Tibetan language of Yunnan, China
  • Nauruan language (ISO code: na)

Organizations

  • Narcotics Anonymous (NA), a twelve-step program that focuses on recovery from drug addiction
  • National Alliance (Latvia), a Latvian political party
  • National Alliance (Netherlands), a former Dutch political party
  • National Association (disambiguation)
  • National Association of Professional Base Ball Players, the first professional baseball league
  • Nepali Army, the land military force of Nepal
  • Neurotics Anonymous (N/A), a program for recovery from mental and emotional illness
  • New Alternative, a parliamentary group in Finland

Other uses

  • .na, the top-level domain for Namibia
  • N/A, meaning not applicable, not available, or no answer
  • N.A., the official designation of federally chartered banks in the United States
  • Mosuo or Na, an ethnic group in China near Tibet
  • Na people, an ethnic group in India
  • National Archives, the archives of a country

See also

  • Nå (disambiguation)
  • Na Na (disambiguation)
  • Na Na Na (disambiguation)