Na

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