Na

Look up na, Na, or NA in Wiktionary, the free dictionary.

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

Organizations

• Neurotics Anonymous (N/A), a twelve-step program for recovery from mental and emotional illness
• Narcotics Anonymous (NA), a twelve-step program that focuses on addiction
• National Alliance (Latvia), a Latvian political party
• National Alliance (Netherlands), a former Dutch political party
• National Association, federally chartered banks in the United States
• National Association of Professional Base Ball Players, the first professional baseball league
• Nepal Airlines, National flag carrier airline of Nepal
• Nepalese Army, Land military force of Nepal
• North American Airlines (IATA code: NA)

Language

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

Names

• Na or 羅, a Korean surname related to the Chinese surname Luo
• Na, a particle used in Thai noble names

Places

• Na (state), a small state of Zhou Dynasty
• Namibia (ISO country code)
• Naples (car number plate code: NA), Italy
• Netherlands Antilles (former international vehicle registration code: NA)
• North America, a continent

Science and technology

• .na, the top-level domain for Namibia
• Sodium (symbol Na), a chemical element
• Avogadro constant (N_A)
• Numerical aperture, a number that characterizes a range of angles in an optical system
• Naturally aspirated engine
• Nucleophilic addition, a type of reaction in organic chemistry

Biology and medicine

• Na (tree) or Mesua ferrea, a species of tree native to Sri Lanka
• Neuroacanthocytosis, neurological conditions in which the blood contains misshapen, spiculated red blood cells called acanthocytes
• Nomina Anatomica, a former international standard for human anatomical nomenclature
• Noradrenaline or norepinephrine, a hormone
• Nucleic acid analogue, compounds analogous to naturally occurring RNA and DNA, used in medicine and in molecular biology

Other uses

• n/a, not applicable, not available, or no answer
• Na (drum), a drum played by Tibetan shamans
• Na people, a small tribal group in India
• Mosuo or Na, a small ethnic group in China near Tibet
• National Academician, a member of the National Academy of Design
• Virgin New Adventures, a series of Doctor Who novels

See also

• National Association (disambiguation)
• Nå (disambiguation)
• Na Na (disambiguation)
• Na Na Na (disambiguation)