A2, A02, A002, A², A.II or A-2 may refer to:

Biology and medicine

British NVC community A2 (Lemna minor 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 plant community * A2, the second

anal vein Anal may refer to: Related to the anus *Related to the anus of animals: ** Anal fin, in fish anatomy ** Anal vein, in insect anatomy ** Anal scale, in reptile anatomy *Related to the human anus: ** Anal sex, a type of sexual activity involvi ...

in the Comstock-Needham system of insect wing segment naming

Genes and proteins

* A-box 2 of insulin gene *

HLA-A2 HLA-A*02 (A*02) is a human leukocyte antigen serotype within the HLA-A serotype group. The serotype is determined by the antibody recognition of the α2 domain of the HLA-A α-chain. For A*02, the α chain is encoded by the HLA-A*02 gene and the ...

, a human MHC HLA-A serotype gene *

Ectodysplasin A2 receptor Tumor necrosis factor receptor superfamily member 27 is a protein that in humans is encoded by the ''EDA2R'' gene. EDA-A1 and EDA-A2 are two isoforms of ectodysplasin that are encoded by the anhidrotic ectodermal dysplasia (EDA) gene. Mutations i ...

, a protein that in humans is encoded by the EDA2R gene *

Alpha-2 adrenergic receptor The alpha-2 (α2) adrenergic receptor (or adrenoceptor) is a G protein-coupled receptor (GPCR) associated with the Gi heterotrimeric G-protein. It consists of three highly homologous subtypes, including α2A-, α2B-, and α2C-adrenergic. Some ...

* Annexin A2, a protein * Apolipoprotein A2, a protein * Phospholipase A2, an enzyme * Prokaryotic phospholipase A2, an enzyme *

Hemoglobin A2 Hemoglobin A2 (HbA2) is a normal variant of hemoglobin A that consists of two alpha and two delta chains (α2δ2) and is found at low levels in normal human blood. Hemoglobin A2 may be increased in beta thalassemia or in people who are heterozy ...

, a protein *

Proanthocyanidin A2 Procyanidin A2 is an A type proanthocyanidin. It is found in avocado, chestnut, cranberry juice concentrate, lychee fruit pericarp, peanut The peanut (''Arachis hypogaea''), also known as the groundnut, goober (US), pindar (US) or monke ...

, an A type proanthocyanidin * Urea transporter A2, a protein * A2, a variant of blood groups alleles A in the

ABO blood group system The ABO blood group system is used to denote the presence of one, both, or neither of the A and B antigens on erythrocytes. For human blood transfusions, it is the most important of the 43 different blood type (or group) classification system ...

* A2, a subfamily of

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 ...

Medicine

* ATC code A02 ''Drugs for acid related disorders'', a subgroup of the Anatomical Therapeutic Chemical Classification System * Brachydactyly type A2, a disease *

Noradrenergic cell group A2 Noradrenergic cell group A2 is a group of cells in the vicinity of the dorsal motor nucleus of the vagus nerve in the medulla that label for norepinephrine Norepinephrine (NE), also called noradrenaline (NA) or noradrenalin, is an organic c ...

Computing

* A-2 (programming language), a follow-on to the A-0 System used on UNIVAC I *

A2 (operating system) A2 (formerly named Active Object System (AOS), and then Bluebottle) is a modular, object-oriented operating system, with some unconventional features, including automatic garbage-collected memory management, and a zooming user interface. It was ...

, software to run a computer

Electronics

DiMAGE A2 DiMAGE A2 is a digital camera which was manufactured by Konica Minolta, announced on February 12, 2004. Specifications The Konica Minolta DiMAGE A2 is a discontinued, 8 megapixel CCD digital camera. Sony bought out the Konica Minolta line and f ...

, a digital camera produced by Minolta *

IBM A2 The IBM A2 is an open source massively multicore capable and multithreaded 64-bit Power ISA processor core designed by IBM using the Power ISA v.2.06 specification. Versions of processors based on the A2 core range from a 2.3 GHz version with ...

, an IBM processor used in its supercomputers * Cowon A2, a portable multimedia player from

Cowon Cowon Systems, Inc. (simply known as Cowon) is a South Korean consumer electronics and software corporation. The company’s initial focus was software development and microelectronics, specializing in speech synthesis and speech recognition te ...

Gaming

* '' A2 Racer'', a racing computer game series * '' A2 Secret of the Slavers Stockade'', a module in the ''Scourge of the Slave Lords'' series for ''Dungeons & Dragons'' * '' Final Fantasy Tactics A2: Grimoire of the Rift''

Language

* Biu-Mandara A.2 languages, an Afro-Asiatic family of languages spoken in Nigeria * A2, a second language level in the

IB Group 2 subjects The Group 2: Language acquisition (previously Second Language) subjects of the IB Diploma Programme consist of the nearly 80 additional languages offered and may be studied at the following levels: B (SL or HL), or ab initio (SL only). Schools' Gu ...

* A2, a level in the

Common European Framework of Reference for Languages The Common European Framework of Reference for Languages: Learning, Teaching, Assessment, abbreviated in English as CEFR or CEF or CEFRL, is a guideline used to describe achievements of learners of foreign languages across Europe and, increasing ...

Military

A-2 jacket The Type A-2 leather flight jacket is an American military flight jacket originally invented and developed for and closely associated with World War II U.S. Army Air Forces pilots, navigators and bombardiers, who often decorated their jackets ...

, a leather flight jacket * A2, the military staff designation in the

continental staff system A military staff or general staff (also referred to as army staff, navy staff, or air staff within the individual services) is a group of officers, enlisted and civilian staff who serve the commander of a division or other large military u ...

for air force headquarters staff concerned with intelligence and security * A 2,

Göta Artillery Regiment The Göta Artillery Regiment ( sv, Göta artilleriregemente), designation A 2, was a Swedish Army artillery regiment that traced its origins back to the 17th century. It was disbanded in 1962. The regiment's soldiers were originally recruited fro ...

designation, a former Swedish Army artillery regiment

Music

A due A due in Italian or à deux in French is a musical direction meaning "for two". Most often seen in its abbreviated form ''a2'', the marking signifies that on a staff that normally carries parts for two players, both players are to play the single ...

, a musical term often abbreviated to ''a2'' * A2, a rock band that performed the song "Chosen One" in the video game ''

Shadow the Hedgehog is a fictional character appearing in Sega's ''Sonic the Hedgehog'' franchise. Shadow was created by Takashi Iizuka and Shiro Maekawa, and first made his debut in ''Sonic Adventure 2'' (2001). Although this was intended to be his only appearan ...

Sport

* A2 (classification), an amputee sport classification * HEBA A2, a Greek basketball league * A2 volleyball league (Portugal) * A2 women's volleyball league (Portugal) * A2, an

Italian Baseball League The Italian Baseball League (IBL; Italian: ') is a professional baseball league that is governed by FIBS (Italian Baseball & Softball Federation), which has its headquarters in Rome. The IBL is a wood bat league in which both composite and alumi ...

* A2, an

Italian Volleyball League Italian(s) may refer to: * Anything of, from, or related to the people of Italy over the centuries ** Italians, an ethnic group or simply a citizen of the Italian Republic or Italian Kingdom ** Italian language, a Romance language *** Regional Ita ...

* A2, a grade in climbing

Television

A2 (remote television production) Television crew positions are derived from those of film crew, but with several differences. Pre-production : Work before shooting begins is called the pre-production stage. The crew in this stage include the casting director, costume desig ...

, a person who manages audio equipment *

A2 Stereo Zweikanalton ("two-channel sound") or A2 Stereo, is an analog television sound transmission system used in Germany, Austria, Australia, Switzerland, Netherlands and some other countries that use or used PAL-B or PAL-G. TV3 Malaysia formerly used ...

or , a television broadcasting system * A2 Teema, a panel discussion episode of '' Ajankohtainen kakkonen'', a Finnish television series

Transportation

Air

* A-2 Savage or AJ Savage, an aircraft *

Abrial A-2 Vautour The A-2 ''Vautour'' (''Vulture'') was a single-seat French glider that was designed by Georges Abrial. It performed well at the Vauville competition of 1925. Design The Vautour was designed by Georges Abrial of the ''Institut Aérotechnique ...

, a French sailplane built in 1925 * Antonov A-2, a Soviet glider *

Breda A.2 The Breda A.2 was a small sport and touring aircraft developed in Italy in 1921. Design and development An advanced design for its time, the A.2 was a low-wing cantilever monoplane A monoplane is a fixed-wing aircraft configuration with a ...

, a 1921 Italian aircraft * Fokker A.II, a German aircraft * Nikol A-2, 1939 a prototype of a Polish amphibious flying boat * Pfalz A.II, a German Idflieg A-class designation aircraft *

Reaction Engines A2 The Reaction Engines Limited LAPCAT Configuration A2 (called the LAPCAT A2) is a design study for a hypersonic speed jet airliner intended to provide, long range, high capacity commercial transportation. The aircraft was designed, ...

, a design study for a hypersonic airliner under development *

Cielos Airlines Cielos Airlines, commonly known by its old name Cielos del Peru S.A., was a cargo airline based in Callao, Peru. It operated scheduled, ad hoc and contract charter domestic and international cargo services. Its main base was Jorge Chávez Interna ...

's IATA code * A-2, United States Navy alphanumeric code for the

North American AJ Savage The North American AJ Savage (later A-2 Savage) is an American carrier-based aircraft, carrier-based medium bomber built for the United States Navy by North American Aviation. The aircraft was designed shortly after World War II to carry atomic ...

carrier-launched bomber * A2, a Botswana

aircraft registration An aircraft registration is a code unique to a single aircraft, required by Chicago Convention, international convention to be marked on the exterior of every civil aircraft. The registration indicates the aircraft's country of registration, and ...

code

Rail

* Bavarian A II, an 1847 German steam locomotive model *

LNER Class A2 The first London and North Eastern Railway (LNER) Class A2 was a class of 4-6-2 steam locomotive designed by Vincent Raven for the North Eastern Railway (as NER class 4.6.2). Two were built by the NER in 1922 before the grouping and another t ...

, a class of steam locomotives *

LNER Peppercorn Class A2 The London and North Eastern Railway (LNER) Peppercorn Class A2 is a class of steam locomotive designed for express passenger work by Arthur Peppercorn, the chief designer of the LNER after Edward Thompson. All save the first of the 15 bu ...

, a class of steam locomotives * LNER Thompson Class A2, 3 classes of Pacific locomotives *

Milwaukee Road class A2 The Milwaukee Road's A2 class comprised 47 compound steam locomotives of the 4-4-2 or 'Atlantic' configuration. The Milwaukee Road acquired them in five batches. The first two batches of 9 and 19 locomotives (classes A2 and A2-a) were built by ...

, a 1901 4-4-2 type steam locomotive * SP&S Class A2, an 1887 steam locomotives class *

Victorian Railways A2 class The A2 class was an express passenger locomotive that ran on Victorian Railways from 1907 to 1963. A highly successful design entirely the work of Victorian Railways' own design office, its long service life was repeatedly extended as the Great ...

, a 1907 Australian steam locomotive *

PRR A2 PRR may refer to: * Parietal reach region, of the human brain * Pattern recognition receptor, receptors of the innate immune system that identify pathogen-associated molecular patterns * Pennsylvania Railroad (reporting mark), an American railroad ...

, a

Pennsylvania Railroad locomotive classification Locomotive classification on the Pennsylvania Railroad took several forms. Early on, steam locomotives were given single-letter classes. As the 26 letters were quickly assigned, that scheme was abandoned for a more complex system. This was used fo ...

* Prussian A 2, a Prussian railbus model

Road

List of A2 roads This is a list of roads designated A2. Roads entries are sorted alphabetically by country. * A2 motorway (Albania), a road connecting Vlore with Fier * A002 road (Argentina), a road connecting Avenida General Paz and Ministro Pistarini Interna ...

* Anadol A2, a 1970 Turkish car *

Arrows A2 The Arrows A2 was a Formula One racing car, designed by Tony Southgate and Dave Wass, was used by the Arrows team in the latter half of the 1979 Formula One season. Powered by a Cosworth DFV V8 engine and driven by Riccardo Patrese and Jochen Mas ...

, a 1979 British racing car *

Audi A2 The Audi A2 (internally designated ''Typ'' 8Z) is a compact MPV-styled supermini car, with a five-door hatchback body style and four or five seats,ETKA official factory data produced by the German manufacturer Audi from November 1999 (for the 200 ...

, a 1999 automobile * Merzario A2, see template:F1 cars 1979 * Route A2 (WMATA), a bus route operated by the Washington Metropolitan Area Transit Authority * Audi Quattro A2, a 1984 rally car evolution of the

Audi Quattro The Audi Quattro is a road and rally car, produced by the German automobile manufacturer Audi, part of the Volkswagen Group. It was first shown at the 1980 Geneva Motor Show on 3 March. Production continued through 1991. Background The word ...

Sea

* HMS ''A2'', a Royal Navy A-class submarine * Type A2 submarine, a submarine of the Imperial Japanese Navy during World War II * T2-SE-A2, a type of oil tanker constructed and produced in large quantities in the United States during World War II * Sea Area A2, as defined under the GMDSS system

Space

* Saturn A-2, a 1959 American rocket *

A-002 A-002 was the third abort test of the Apollo spacecraft. Objectives Mission A-002 was the third in the series of abort tests to demonstrate that the launch system would perform satisfactorily under selected critical abort conditions. The main o ...

, the third abort test of the Apollo spacecraft * Aussat (Optus) A2, a 1985 Australian satellite

Tanks

* M1A2, a version of the American

M1 Abrams The M1 Abrams is a third-generation American main battle tank designed by Chrysler Defense (now General Dynamics Land Systems) and named for General Creighton Abrams. Conceived for modern armored ground warfare and now one of the heaviest ta ...

tank * M60A2, a version of the American

M60 Patton The M60 is an American second-generation main battle tank (MBT). It was officially standardized as the Tank, Combat, Full Tracked: 105-mm Gun, M60 in March 1959. Although developed from the M48 Patton, the M60 tank series was never officially ...

tank

Weapons

A2 (rocket) The Aggregat series (German for "Aggregate") was a set of ballistic missile designs developed in 1933–1945 by a research program of Nazi Germany's Armed Forces (Wehrmacht). Its greatest success was the A4, more commonly known as the V-2. ...

, a German rocket design (1934) * AUG A2 Commando, a variant of the Austrian Steyr AUG rifle *

M16A2 rifle The M16 rifle (officially designated Rifle, Caliber 5.56 mm, M16) is a family of military rifles adapted from the ArmaLite AR-15 rifle for the United States military. The original M16 rifle was a 5.56×45mm automatic rifle with a 20-roun ...

, a variant of the M16 rifle of the United States Army * AR-15A2, a variant of the

Colt AR-15 The Colt AR-15 is a lightweight, magazine-fed, gas-operated semi-automatic rifle. It is a semi-automatic version of the M16 rifle sold for the civilian and law enforcement markets in the United States. Colt's Manufacturing Company currently ...

rifle * M16A2 mine, a variant of the

M16 mine The M16 mine is a United States-made bounding anti-personnel mine. It was based on captured plans of the World War II era German S-mine and has similar performance. The mine consists of a cast iron body in a thin steel sleeve. A central fuze we ...

of the United States Army * Polaris A-2, a variant of the

Polaris missile The UGM-27 Polaris missile was a two-stage solid-fueled nuclear-armed submarine-launched ballistic missile (SLBM). As the United States Navy's first SLBM, it served from 1961 to 1980. In the mid-1950s the Navy was involved in the Jupiter missile ...

of the United States Navy

Other uses

A2 (theater) A2 is an abbreviation for "Production Audio Technician", Audio Assistant, Second Audio Assistant, or Second Assistant Audio Engineer. Any of these three terms, or any similar term such as Mic Wrangler, may be used to describe the same set of dutie ...

, a person who manages audio equipment * DIN4102 A2, a flammability rating for materials ~98% noncombustible * A2-level, an education qualification in England, Wales and Northern Ireland *

A2 milk A2 milk is a variety of cows' milk that mostly lacks a form of β-casein proteins called A1, and instead has mostly the A2 form. Cows' milk like this was brought to market by The a2 Milk Company and is sold mostly in Australia, New Zealand, Ch ...

, a trademark of the A2 Corporation * Radio Station A2, a radio station in Lithuania *

A-2 tool steel Tool steel is any of various carbon steels and alloy steels that are particularly well-suited to be made into tools and tooling, including cutting tools, dies, hand tools, knives, and others. Their suitability comes from their distinctive ha ...

, an air-hardening SAE grade of tool steel *

A-2 visa An A Visa is a category of non-immigrant visas allowing travel to the United States issued to ambassadors, diplomats, government officials, and their support staff. Types A-1 The A-1 visa is granted to many people such as ambassadors, ministers, di ...

, a document given to officials representing a foreign government inside the United States of America *

Agence de l'innovation industrielle The Agence de l'innovation industrielle was a French governmental agency created in 2005 to support technological projects. As of 2006, it was supporting seven projects: *BioHub, a chemistry projects to create products with cereals, without using ...

(AII), a French governmental agency for technological projects *

Ann Arbor, Michigan Ann Arbor is a city in the U.S. state of Michigan and the county seat of Washtenaw County, Michigan, Washtenaw County. The 2020 United States census, 2020 census recorded its population to be 123,851. It is the principal city of the Ann Arbor ...

, often referred to as A2 or A² *

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 ...

's Encyclopaedia of Chess Openings code * A2, an international standard paper size * A2 or SAE 304, a grade of

stainless steel Stainless steel is an alloy of iron that is resistant to rusting and corrosion. It contains at least 11% chromium and may contain elements such as carbon, other nonmetals and metals to obtain other desired properties. Stainless steel's corros ...

for fasteners * A2, a UK Town and Country Planning use class * ''A II'', a painting by

László Moholy-Nagy László Moholy-Nagy (; ; born László Weisz; July 20, 1895 – November 24, 1946) was a Hungarian painter and photographer as well as a professor in the Bauhaus school. He was highly influenced by constructivism and a strong advocate of the i ...

, painted in 1924 * Sea Area A2, a GMDSS system area * YoRHa Type A No. 2, or A2, a character from the video game '' Nier: Automata''