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

Chemistry and physics

Sodium Sodium is a chemical element with the symbol Na (from Latin ''natrium'') and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable iso ...

, symbol Na, a chemical element *

Avogadro constant The Avogadro constant, commonly denoted or , is the proportionality factor that relates the number of constituent particles (usually molecules, atoms or ions) in a sample with the amount of substance in that sample. It is an SI defining con ...

(''N''_A) *

Nucleophilic addition In organic chemistry, a nucleophilic addition reaction is an addition reaction where a chemical compound with an electrophilic double or triple bond reacts with a nucleophile, such that the double or triple bond is broken. Nucleophilic additions di ...

, a type of reaction in organic chemistry *

Numerical aperture In optics, the numerical aperture (NA) of an optical system is a dimensionless number that characterizes the range of angles over which the system can accept or emit light. By incorporating index of refraction in its definition, NA has the proper ...

, a number that characterizes a range of angles in an optical system * nA, the symbol for nanoampere *

Naturally aspirated engine Naturally may refer to: ;Albums * ''Naturally!'', an album by Nat Adderley * ''Naturally'' (Houston Person album) * ''Naturally'' (J. J. Cale album) * ''Naturally'' (John Pizzarelli album) * ''Naturally'' (Sharon Jones album) * ''Naturally'' ...

Biology and medicine

Na (tree) ''Mesua ferrea'', the Ceylon ironwood, or cobra saffron, is a species in the family Calophyllaceae. This slow-growing tree is named after the heaviness and hardness of its timber. It is widely cultivated as an ornamental due to its graceful sha ...

or ''Mesua ferrea'', a species of tree native to Sri Lanka *

Neuroacanthocytosis Neuroacanthocytosis is a label applied to several genetic neurological conditions in which the blood contains misshapen, spiculated red blood cells called acanthocytes. The 'core' neuroacanthocytosis syndromes, in which acanthocytes are a typic ...

, a neurological condition * ''

Nomina Anatomica ''Nomina Anatomica'' (''NA'') was the international standard on human anatomic terminology from 1895 until it was replaced by ''Terminologia Anatomica'' in 1998. In the late nineteenth century some 30,000 terms for various body parts were in use ...

'', a former international standard for human anatomical nomenclature *

Noradrenaline Norepinephrine (NE), also called noradrenaline (NA) or noradrenalin, is an organic chemical in the catecholamine family that functions in the brain and body as both a hormone and neurotransmitter. The name "noradrenaline" (from Latin '' ad'', ...

, a hormone * Nucleic acid analogue, compounds analogous to naturally occurring RNA and DNA

Places

Current

Namibia Namibia (, ), officially the Republic of Namibia, is a country in Southern Africa. Its western border is the Atlantic Ocean. It shares land borders with Zambia and Angola to the north, Botswana to the east and South Africa to the south and ea ...

(ISO country code) *

Naples Naples (; it, Napoli ; nap, Napule ), from grc, Νεάπολις, Neápolis, lit=new city. is the regional capital of Campania and the third-largest city of Italy, after Rome and Milan, with a population of 909,048 within the city's adminis ...

(car number plate code: NA), Italy *

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...

, a continent *

North Africa North Africa, or Northern Africa is a region encompassing the northern portion of the African continent. There is no singularly accepted scope for the region, and it is sometimes defined as stretching from the Atlantic shores of Mauritania in ...

, a subcontinent

Historical

Netherlands Antilles nl, In vrijheid verenigd"Unified by freedom" , national_anthem = , common_languages = Dutch English Papiamento , demonym = Netherlands Antillean , capital = Willemstad , year_start = 1954 , year_end = 2010 , date_start = 15 December , ...

(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 was a stateIn Japanese, the character 国/國, read as ''koku'' (in on'yomi) or ''kuni'' (in kun'yomi), can be translated as "country" or "province" which was located in and around modern-day Fukuoka City, on the Japanese island of Kyūshū, ...

, 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 Luo may refer to: Luo peoples and languages *Luo peoples, an ethno-linguistic group of eastern and central Africa **Luo people of Kenya and Tanzania or Joluo, an ethnic group in western Kenya, eastern Uganda, and northern Tanzania. *** Luoland, th ...

* Na, a particle used in Thai noble names *

National Academician The National Academy of Design is an honorary association of American artists, founded in New York City in 1825 by Samuel Morse, Asher Durand, Thomas Cole, Martin E. Thompson, Charles Cushing Wright, Ithiel Town, and others "to promote the f ...

, a member of the National Academy of Design

Art and entertainment

Na (drum) A lag-na, or na, is an ancient Tibetan frame drum. The drumhead has a minimum diameter of about one metre. Like the ''dhyāngro'' (the principal drum of the '' jhakri'' shamans of Nepal), the lag-na has a carved, wooden handle. One plays the na b ...

, a drum played by Tibetan shamans * Nahal, Shine's pet Bengal tiger on the Nick Jr. TV show ''

Shimmer and Shine ''Shimmer and Shine'' is an American animated television series created by Farnaz Esnaashari-Charmatz and produced by Nickelodeon Animation Studio. It premiered on Nickelodeon's Nick Jr. block on August 24, 2015, and ran for four seasons. The sh ...

'' *

New adult fiction New adult (NA) fiction is a developing genre of fiction with protagonists in the 18–29 age bracket. St. Martin's Press first coined the term in 2009, when they held a special call for "fiction similar to young adult fiction (YA) that can be publ ...

, fiction marketed to people 18–30 years old * ''

Virgin New Adventures The ''Virgin New Adventures'' (NA series, or NAs) are a series of novels from Virgin Publishing based on the British science-fiction television series ''Doctor Who''. They continued the story of the Doctor from the point at which the televisio ...

'', a series of ''Doctor Who'' novels

Transport

* NA, the tailcode of

VFA-94 Strike Fighter Squadron 94 (VFA-94), also known as the Mighty Shrikes, is a United States Navy fighter squadron stationed at Naval Air Station Lemoore. It is an operational fleet squadron currently flying the F/A-18F Super Hornet. It is attache ...

Nepal Airlines Nepal Airlines Corporation ( ne, नेपाल वायुसेवा निगम, Nepāl Vāyusevā Nigam, Nepal Air Service Corporation), formerly known as Royal Nepal Airlines ( ne, शाही नेपाल वायुसेवा, ...

, the national flag carrier airline of Nepal *

North American Airlines North American Airlines, Inc., was a United States airline with its headquarters at the HLH Building in Peachtree City, Georgia in Greater Atlanta, United States. Prior to May 2008, it operated scheduled international services from the U.S. to Af ...

(IATA code: NA) *

* NA MX-5 Miata, the first generation of the Mazda Miata

Language

Na (cuneiform) The cuneiform na sign is a common, multi-use sign, a syllabic for ''na'', and an alphabetic sign used for ''n'', or ''a''; it is common in both the ''Epic of Gilgamesh'' over hundreds of years, and the 1350 BC Amarna letters. In the ''Epic of Gi ...

, a cuneiform sign *

Na (Javanese) is one of syllable in Javanese script that represent the sound /nɔ/, /na/. It is transliterated to Latin as "na", and sometimes in Indonesian orthography as "no". It has another form (''pasangan''), which is , but represented by a single Unicod ...

(ꦤ), a letter in the Javanese script * Na (kana), a Japanese kana *

Na dialect Na (Nah) is a dialect of Bangni, a Sino-Tibetan language spoken in India.Post, Mark W. (2013)''Defoliating the Tani Stammbaum: An exercise in areal linguistics.''Paper presented at the 13th Himalayan Languages Symposium. Canberra, Australian Nat ...

, a Sino-Tibetan variety of India *

Na language Na (or Narua, Mosuo) is a language of the Naish subbranch of the Naic group of the Sino-Tibetan languages. Varieties Yongning Na, which is spoken in Yongning Township, Ninglang County, Lijiang, Yunnan, China China, officially the P ...

(Narua), a Sino-Tibetan language of Yunnan, China *

Nauruan language The Nauruan or Nauru language () is an Austronesian language, spoken natively in the island country of Nauru. Its relationship to the other Micronesian languages is not well understood. Phonology Consonants Nauruan has 16–17 consonant p ...

(ISO code: na)

Organizations

Narcotics Anonymous Narcotics Anonymous (NA), founded in 1953, describes itself as a "nonprofit fellowship or society of men and women for whom drugs had become a major problem." Narcotics Anonymous uses a 12-step model developed for people with varied subst ...

(NA), a twelve-step program that focuses on recovery from drug addiction *

National Alliance (Latvia) The National Alliance ( lv, Nacionālā apvienība, NA), officially the National Alliance "All for Latvia!" – "For Fatherland and Freedom/LNNK" (), is a national-conservative and right-wing populist political party in Latvia. A right-wing ...

, a Latvian political party * National Alliance (Netherlands), a former Dutch political party * National Association (disambiguation) *

National Association of Professional Base Ball Players The National Association of Professional Base Ball Players (NAPBBP), often known simply as the National Association (NA), was the first fully- professional sports league in baseball. The NA was founded in 1871 and continued through the 1875 se ...

, the first professional baseball league *

Nepali Army The Nepali Army ( ne, नेपाली सेना, translit=Nēpālī Sēnā), technically the Gorkhali Army ( ne, गोरखाली सेना, translit=Gōrakhālī Sēnā, label=none; see ''Gorkhas''), is the land service branch ...

, the land military force of Nepal * Neurotics Anonymous (N/A), a program for recovery from mental and emotional illness

Other uses

.na .na is the Internet country code top-level domain (ccTLD) for Namibia corresponding to the two letter code from the ISO-3166 standard. The registry accredits both Namibian and foreign registrars. Registrars access the Registry and register domai ...

, 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 The Mosuo (; also spelled Moso, Mosso or Musuo), often called the Naxi among themselves, are a small ethnic group living in China's Yunnan and Sichuan provinces, close to the border with Tibet. Consisting of a population of approximately 40,000, ...

or Na, an ethnic group in China near Tibet *

Na people The Nah people is a small tribal group residing in the higher reaches, below the great Himalayan ranges in Upper Subansiri district of Arunachal Pradesh, India. Within the district, they are found in the villages within Taksing circle: Gumsing, ...

, an ethnic group in India