# A3

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{{for|the Wikipedia A3 criterion for speedy deletion|Wikipedia:Criteria for speedy deletion#A3|selfref=y}}
{{wiktionary|A-3|A3|a3}}
'''A3''', '''A03''' or '''A.III''' may refer to:

* [A3 paper](/source/A3_paper), a paper size defined by ISO 216

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==Biology ==
* [A3 regulatory sequence](/source/A3_regulatory_sequence), a sequence for the insulin gene
* [Adenosine A<sub>3</sub> receptor](/source/Adenosine_A3_receptor), a human gene
* [Annexin A3](/source/Annexin_A3), a human gene
* [ATC code A03](/source/ATC_code_A03) ''Drugs for functional gastrointestinal disorders'', a subgroup of the Anatomical Therapeutic Chemical Classification System
* [Brachydactyly type A3](/source/Brachydactyly_type_A3), a disease
* [British NVC community A3 (Spirodela polyrhiza - Hydrocharis morsus-ranae community)](/source/British_NVC_community_A3_(Spirodela_polyrhiza_-_Hydrocharis_morsus-ranae_community)), a British Isles plants community
* [Gibberellin A3](/source/Gibberellin_A3), a plant hormone
* [HLA-A3](/source/HLA-A3), a Human MHC Serotype HLA-A
* Subfamily A3, a [rhodopsin-like receptors](/source/rhodopsin-like_receptors) subfamily
* [Urea transporter A3](/source/Urea_transporter_A3), a trans-membrane protein

==Games==
* ''[A3!](/source/A3!)'', a Japanese video game and multimedia franchise
* [A3 - Assault on the Aerie of the Slave Lords](/source/A3_-_Assault_on_the_Aerie_of_the_Slave_Lords), a 1981 module for the Dungeons & Dragons fantasy role-playing game
* [Alpha Trion](/source/Alpha_Trion), as the former name of this character from the Transformers Series
* [Bird's Opening](/source/Bird's_Opening) (A03), in chess, by the Encyclopaedia of Chess Openings code

==Music==
* A3, a [musical note](/source/musical_note), the A below Middle C
* [Alabama 3](/source/Alabama_3), a band known as A3 in the U.S. to avoid confusion with the country group Alabama
* A-3, a [Yamaha musical instrument product](/source/List_of_Yamaha_products)

==Sports==
* [A3 (classification)](/source/A3_(classification)), an amputee sport classification
* [A3 Champions Cup](/source/A3_Champions_Cup), a club football tournament also known as the East Asian Champions Cup
* [Arrows A3](/source/Arrows_A3), a 1980 racing car
* A3, a [climbing grade](/source/grade_(climbing))

==Vehicles==
* [A-3 lifeboat](/source/A-3_lifeboat), a 1947 lifeboat for carrying by the SB-29 Superfortress
* [Abrial A-3 Oricou](/source/Abrial_A-3_Oricou), a French touring aircraft designed in 1927
* [Audi A3](/source/Audi_A3), a model of automobile
* [Aussat (Optus) A3](/source/Aussat_(Optus)_A3), a 1987 Australian telecommunication satellite
* [Bavarian A III](/source/Bavarian_A_III), an 1851 German steam locomotive model
* [Chery A3](/source/Chery_A3), a compact car
* [LNER Gresley Classes A1 and A3](/source/LNER_Gresley_Classes_A1_and_A3), a Pacific locomotive class designed by Sir Nigel Gresley
* [SP&S Class A3](/source/SP%26S_Class_A3), a 1914 steam locomotives class

==Weapons and military==
* A-3 Falcon, a variant of the [Curtiss Falcon](/source/Curtiss_Falcon), an attack aircraft manufactured by the Curtiss Aircraft Company
* [A-3 Skywarrior](/source/A-3_Skywarrior), a strategic bomber manufactured by Douglas Aircraft Company
* [AUG A3](/source/AUG_A3), a variant of the Austrian Steyr AUG rifle
* [Fokker A.III](/source/Fokker_A.III), a 1915 armed version of the Fokker M.5 aircraft
* [HMS ''A3''](/source/HMS_A3), a British A-class submarine of the Royal Navy
* [''Kampfgeschwader'' 200](/source/Kampfgeschwader_200), from its historic ''Geschwaderkennung'' code with the Luftwaffe in World War II
* [Polaris A-3 missile](/source/Polaris_A-3_missile), an American submarine-launched missile
* [Wendes Artillery Regiment](/source/Wendes_Artillery_Regiment), a former Swedish Army artillery regiment, by designation
* A3, the [staff designation](/source/Continental_Staff_System) for air force headquarters staff concerned with operations
** A3 Air Operations Branch, of the [Joint Force Air Component Headquarters](/source/Joint_Force_Air_Component_Headquarters) UK
* [USS ''Grampus'' (SS-4)](/source/USS_Grampus_(SS-4)), a ''Plunger''-class submarine of the United States Navy
* [Aggregate 3](/source/Aggregate_3), the 3rd design in the Aggregate family of rockets, precursor to the V-2 rocket, developed by the Germans during World War II

==Other uses==
* A<sub>3</sub>, an example of a [root system](/source/root_system) with numerous physical and geometrical applications
* [A-3 visa](/source/A-3_visa), a document given to employees of A-1 and A-2 Visa Holders who are representing a foreign government inside the U.S.
* A3, the code for permission to use specific land or premises for restaurants and cafés in [town and country planning in the United Kingdom](/source/town_and_country_planning_in_the_United_Kingdom)
* [A3 roads](/source/A3_roads), in several countries
* [A-003](/source/A-003), the fourth abort test of the Apollo spacecraft
* [Biu-Mandara A.3 languages](/source/Biu-Mandara_A.3_languages), an Afro-Asiatic family of languages spoken in Cameroon and Nigeria
* Comet A3 also known as  [C/2023 A3 (Tsuchinshan–ATLAS)](/source/C%2F2023_A3_(Tsuchinshan%E2%80%93ATLAS))
* [Cowon A3](/source/Cowon_A3), an audio media player
* [Aegean Airlines](/source/Aegean_Airlines), by IATA code 
* [Tonga](/source/Tonga), by aircraft registration code
* [ARITH-MATIC](/source/ARITH-MATIC), as the former name for this programming language
* "Agora! Anarchy! Action!", a slogan for Agorism taken from the ''[New Libertarian Manifesto](/source/New_Libertarian_Manifesto)'' by Samuel Edward Konkin III
* [A3 problem solving](/source/A3_problem_solving), a structured problem solving and continuous improvement approach, first employed at Toyota
* [Samsung Galaxy A3](/source/Samsung_Galaxy_A3), a smartphone manufactured by Samsung Electronics
* [Samsung Galaxy A03](/source/Samsung_Galaxy_A03), a smartphone manufactured by Samsung Electronics
* [A³ (A-cubed)](/source/Airbus_A%C2%B3_Vahana), an [Airbus](/source/Airbus) start-up in the Silicon Valley
* [A3 (TV channel)](/source/A3_(TV_channel)), an Algerian public national television channel also known as Thalitha TV
* [RED A03](/source/RED_A03), an aircraft diesel engine by German company Red Aviation GmbH
* Zeolite A-3, a potassium-type [molecular sieve](/source/molecular_sieve) also known as 3A.
* Lely Astronaut A3, the third version of the Astronaut robot manufactured by [Lely](/source/Lely_(company))

==See also==
* [3A (disambiguation)](/source/3A_(disambiguation))
* [A-Train III](/source/A-Train_III), a 1992 computer game
* [M16A3](/source/M16A3), a variant of the American M16 rifle
* M60A3, a variant of the American [M60 Patton](/source/M60_Patton) tank
* A3J, the original designation of the US Navy's [A-5 Vigilante](/source/A-5_Vigilante) bomber

{{Letter-Number Combination Disambiguation}}

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Adapted from the Wikipedia article [A3](https://en.wikipedia.org/wiki/A3) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/A3?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.