A3, A03 or A.III may refer to: * A3 paper, a paper size defined by ISO 216

Biology

* A3 regulatory sequence, a sequence for the insulin gene * Adenosine A₃ receptor, a human gene *

Annexin A3 Annexin A3 is a protein that in humans is encoded by the ''ANXA3'' gene. It is abnormally expressed in fetuses of both IVF and ICSI, which may contribute to the increase risk of birth defects in these ART. This gene encodes a member of the annex ...

, a human gene *

ATC code A03 A03A Drugs for functional gastrointestinal disorders A03AA Synthetic anticholinergics, esters with tertiary amino group :A03AA01 Oxyphencyclimine :A03AA03 Camylofin :A03AA04 Mebeverine :A03AA05 Trimebutine :A03AA06 Rociverine :A03AA07 Dicy ...

''Drugs for functional gastrointestinal disorders'', a subgroup of the Anatomical Therapeutic Chemical Classification System * Brachydactyly type A3, a disease *

British NVC community A3 (Spirodela polyrhiza - Hydrocharis morsus-ranae community) This article gives an overview of the aquatic communities in the British National Vegetation Classification system. Introduction The aquatic communities of the NVC were described in Volume 4 of '' British Plant Communities'', first published in ...

, a British Isles plants community * Gibberellin A3, a plant hormone * HLA-A3, a Human MHC Serotype HLA-A * Subfamily A3, a

rhodopsin-like receptors Rhodopsin-like receptors are a family of proteins that comprise the largest group of G protein-coupled receptors. Scope G-protein-coupled receptors, GPCRs, constitute a vast protein family that encompasses a wide range of functions (including ...

subfamily *

Urea transporter A3 A urea transporter is a membrane transport protein, transporting urea. Humans and other mammals have two types of urea transport proteins, UT-A and UT-B. The UT-A proteins are important for renal urea handling and are produced by alternative spli ...

, a trans-membrane protein

Games

* ''

A3! ''A3!'' (acronym for "Act! Addict! Actors!") is a Japanese mobile game developed by Liber Entertainment. The game was released on January 27, 2017, in Japan. It was given a worldwide English release on October 23, 2019, which later ended servi ...

'', a Japanese video game and multimedia franchise * A3 - Assault on the Aerie of the Slave Lords, a 1981 module for the Dungeons & Dragons fantasy role-playing game * Alpha Trion, as the former name of this character from the Transformers Series *

Bird's Opening Bird's Opening (or the Dutch Attack) is a chess opening characterised by the move: :1. f4 Bird's is a standard flank opening. White's strategic ideas involve control of the e5-square, offering good attacking chances at the expense of slightly ...

(A03), in chess, by the Encyclopaedia of Chess Openings code

Music

* A3, a musical note, the A below Middle C * 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

Sports

* A3 (classification), an amputee sport classification * A3 Champions Cup, a club football tournament also known as the East Asian Champions Cup * Arrows A3, a 1980 racing car * A3, a

climbing grade In rock climbing, mountaineering, and other climbing disciplines, climbers give a grade to a climbing route or boulder problem, intended to describe concisely the difficulty and danger of climbing it. Different types of climbing (such as spor ...

Vehicles

* A-3 lifeboat, a 1947 lifeboat for carrying by the SB-29 Superfortress * Abrial A-3 Oricou, a French touring aircraft designed in 1927 * Audi A3, a model of automobile * Aussat (Optus) A3, a 1987 Australian telecommunication satellite * Bavarian A III, an 1851 German steam locomotive model * Chery A3, a compact car * LNER Gresley Classes A1 and A3, a Pacific Locomotive Designed by Sir Nigel Gresley *

Prussian A 3 Prussia, , Old Prussian: ''Prūsa'' or ''Prūsija'' was a German state on the southeast coast of the Baltic Sea. It formed the German Empire under Prussian rule when it united the German states in 1871. It was ''de facto'' dissolved by an em ...

, a 1910 Prussian railbus * SP&S Class A3, a 1914 steam locomotives class

Weapons and military

* A-3 Falcon, a variant of the Curtiss Falcon, an attack aircraft manufactured by the Curtiss Aircraft Company * A-3 Skywarrior, a strategic bomber manufactured by Douglas Aircraft Company *

AUG A3 The Steyr AUG () is an Austrian bullpup assault rifle chambered for the 5.56×45mm NATO intermediate cartridge, designed in the 1960s by Steyr-Daimler-Puch, and now manufactured by Steyr Arms GmbH & Co KG. It was adopted by the Austrian Army ...

, a variant of the Austrian Steyr AUG rifle * Fokker A.III, a 1915 armed version of the Fokker M.5 aircraft * HMS ''A3'', a British A-class submarine of the Royal Navy * ''Kampfgeschwader'' 200, from its historic ''Geschwaderkennung'' code with the Luftwaffe in World War II * Polaris A-3 missile, an American submarine-launched missile * Wendes Artillery Regiment, a former Swedish Army artillery regiment, by designation * A3, the staff designation for air force headquarters staff concerned with operations ** A3 Air Operations Branch, of the Joint Force Air Component Headquarters UK * USS ''Grampus'' (SS-4), a ''Plunger''-class submarine of the United States Navy * 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

* A₃, an example of a root system with numerous physical and geometrical applications * 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 * A3 roads, in several countries *

A-003 A-003 was the fourth abort test of the Apollo spacecraft. This particular flight is notable because during the abort test flight, an actual abort situation occurred, and further proved the Apollo launch escape system (LES). The CM was successfull ...

, the fourth abort test of the Apollo spacecraft * Biu-Mandara A.3 languages, an Afro-Asiatic family of languages spoken in Cameroon and Nigeria * Cowon A3, an audio media player * Aegean Airlines, by IATA code * Tonga, by aircraft registration code * ARITH-MATIC, as the former name for this programming language * "Agora! Anarchy! Action!", a slogan for Agorism taken from the ''

New Libertarian Manifesto ''New Libertarian Manifesto'' is a libertarianism, libertarian philosophy, philosophical treatise by Samuel Edward Konkin III. It is the first explanation of agorism, a philosophy created by Konkin. Konkin proffers various arguments of how a free ...

'' by Samuel Edward Konkin III *

A3 problem solving A3 problem solving is a structured problem-solving and continuous-improvement approach, first employed at Toyota and typically used by lean manufacturing practitioners.; ; It provides a simple and strict procedure that guides problem solving by w ...

, a structured problem solving and continuous improvement approach, first employed at Toyota *

Samsung Galaxy A3 Samsung Galaxy A3 refers to three Samsung Galaxy Android smart phones released in the 2010s. These are: *Samsung Galaxy A3 (2014); Android smartphone unveiled in October 2014, released in December 2014. *Samsung Galaxy A3 (2015); Android smartphon ...

, a smartphone manufactured by Samsung Electronics *

Samsung Galaxy A03 The Samsung Galaxy A03 is a series of budget Android smartphones manufactured by Samsung Electronics that includes the A03, A03s and A03 Core. They have a 6.5 inch HD+ Infinity-V display, a 5000 mAh Li-Po battery, and ship with Android 11 ...

, a smartphone manufactured by Samsung Electronics * A³ (A-cubed), an Airbus start-up in the Silicon Valley *

A3 (TV channel) TV3 (in ar, الجزائرية الثالثة), also known as El Ikhbariya (in ar, الجزائرية الإخبارية) and formerly Algeria 3 (or simply A3), is the third Algerian public national television news channel. It is part of the st ...

, an Algerian public national television channel also known as Thalitha TV * RED A03, an aircraft diesel engine by German company Red Aviation GmbH