Na

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

Chemistry and physics

• Sodium, symbol Na, a chemical element
• Avogadro constant (N_A)
• 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

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)