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 1 ...

, a plant community * A2, the second anal vein 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, 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 alpha subunit, Gi heterotrimeric G-protein. It consists of three highly homologous subtypes, including α2A-adrenergic, α2A-, ...

Annexin A2 Annexin A2 also known as annexin II is a protein that in humans is encoded by the ''ANXA2'' gene. Annexin 2 is involved in diverse cellular processes such as cell motility (especially that of the epithelial cells), linkage of membrane-associated ...

, a protein *

Apolipoprotein A-II Apolipoprotein A-II is a protein that in humans is encoded by the ''APOA2'' gene. It is the second most abundant protein of the high density Lipoprotein, lipoprotein particles. The protein is found in plasma as a monomer, homodimer, or Heterodime ...

, a protein *

Phospholipase A2 The enzyme phospholipase A2 (EC 3.1.1.4, PLA2, systematic name phosphatidylcholine 2-acylhydrolase) catalyses the cleavage of fatty acids in position 2 of phospholipids, hydrolyzing the bond between the second fatty acid "tail" and the glycero ...

, 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 heterozygo ...

, a protein *

Proanthocyanidin A2 Procyanidin A2 is an A type proanthocyanidin. It is found in avocado, chestnut, cranberry juice concentrate, lychee fruit pericarp, peanut skins, Cinchona cortex, cinnamon Cinnamon is a spice obtained from the inner bark of several tree speci ...

, 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 (red blood cells). For human blood transfusions, it is the most important of the 47 different blood type (or group) c ...

* A2, a subfamily of

rhodopsin-like receptors Rhodopsin-like receptors are a protein family, 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 funct ...

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 ...

Computing

A-2 (programming language) The A-0 system (''Arithmetic Language version 0'') was an early compiler related tool developed for electronic computers, written by Grace Murray Hopper in 1951 and 1952 originally for the UNIVAC I. The A-0 functioned more as a loader or linker t ...

, 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 features including automatic garbage-collected memory management, and a zooming user interface. It was developed originally ...

, software to run a computer

Electronics

DiMAGE A2 The Konica Minolta DiMAGE A2 is a digital bridge camera which was manufactured by Konica Minolta, announced at the Photo Marketing Association exposition on February 12, 2004 as the flagship of Konica Minolta's fixed-lens DiMAGE digital camera line ...

, 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 1 ...

, 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 ...

Gaming

* ''

A2 Secret of the Slavers Stockade ''Scourge of the Slave Lords'' (A1–4) is an adventure module for the ''Dungeons & Dragons'' fantasy role-playing game, published by TSR, Inc. in 1986. It combines the contents of four earlier modules, all set in the World of Greyhawk campaign ...

'', 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' G ...

* 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, CEF, or CEFRL, is a guideline used to describe achievements of learners of foreign languages across Europe and, increasingl ...

Military

A-2 jacket The Type A-2 leather flight jacket is an American military flight jacket closely associated with World War II U.S. Army Air Forces Aviator, pilots, navigators and bombardiers, who often decorated their jackets with Embroidered patch, squadron p ...

, 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 milita ...

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

Göta Artillery Regiment The Göta Artillery Regiment (), 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 from Götaland, and it was also g ...

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 character created by the Japanese game developers Takashi Iizuka (game designer), Takashi Iizuka, Shiro Maekawa, and Kazuyuki Hoshino. He is a major character in Sega's ''Sonic the Hedgehog'' franchise. An Anthropomorphism, anthropomorph ...

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, ), officially known as the Serie A (), is the top-level baseball league in Italy. Founded in 1948, it is governed by the Italian Baseball & Softball Federation (FIBS), which has its headquarters in Rome. Many o ...

* A2, an

Italian Volleyball League The Lega Pallavolo Serie A is structured in several levels of importance; the highest of them is ''SuperLega'' (formerly ''Serie A1''). Since the early 1980s, many among the best volleyball players in the world play in Superlega and the overall ...

* 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 des ...

, a person who manages audio equipment * A2 Stereo or , a television broadcasting system * A2 Teema, a panel discussion episode of ''

Ajankohtainen kakkonen ''Ajankohtainen kakkonen'' was a Finnish current affairs television series broadcast in Finland Finland, officially the Republic of Finland, is a Nordic country in Northern Europe. It borders Sweden to the northwest, Norway to the nort ...

'', a Finnish television series * A2, common abbreviation of Antenne 2, former name (1975–1992) of French national television station

France 2 France 2 () is a French free-to-air public television channel. The flagship channel of France Télévisions, it broadcasts generalist programming including news, entertainment (such as dramas, films, and game shows), factual programmes, and sp ...

Transportation

Air

* A-2 Savage or AJ Savage, an aircraft * Abrial A-2 Vautour, a French sailplane built in 1925 * Antonov A-2, a Soviet glider * Breda A.2, 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 LAPCAT (Long-Term Advanced Propulsion Concepts and Technologies) was a 36-month European FP6 study to examine ways to produce engines for a Mach number 4-8 hypersonic flight aircraft. The project ended in April 2008. It was funded by the European ...

, 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 international convention to be marked on the exterior of every civil aircraft. The registration indicates the aircraft's country of registration, and functions much li ...

code

Rail

Bavarian A II The Bavarian A II engines were early German 2-2-2 steam locomotives with the Royal Bavarian State Railways (''Königlich Bayerische Staatsbahn''). The locomotives were conceived as Stephenson Long Boiler engines. They had an inside forked frame ...

, 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 ...

, 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 buil ...

, a class of steam locomotives * LNER Thompson Class A2, 3 classes of Pacific locomotives * Milwaukee Road class A2, a 1901 4-4-2 type steam locomotive * SP&S Class A2, an 1887 steam locomotives class *

Victorian Railways A2 class The A2 class is 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, 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 f ...

* Prussian A 2, a Prussian railbus model

Road

List of A2 roads A list is a set of discrete items of information collected and set forth in some format for utility, entertainment, or other purposes. A list may be memorialized in any number of ways, including existing only in the mind of the list-maker, bu ...

* 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 lightweight 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 199 ...

, 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 wor ...

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, it is one of the heavies ...

tank * M60A2, a version of the American

M60 Patton The M60 is an American List of main battle tanks by generation#Second, 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 Pa ...

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 Army ( ''Heer''). Its greatest success was the A4, more commonly known as the V2. ...

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

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

, 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 product line of magazine-fed, gas-operated, semi auto rifle manufactured by Colt's Manufacturing Company ("Colt") in many configurations. The rifle is a derivative of its predecessor, the lightweight ArmaLite AR-15, an ...

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. Description The mine consists of a cast iron body in a thin steel sleeve. A ce ...

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

Polaris missile The UGM-27 Polaris missile was a two-stage solid-fuel rocket, solid-fueled nuclear warhead, 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 ...

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 duti ...

, 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 predominantly contains the A2 form of β-casein proteins (as opposed to A1 milk, which contains mostly A1 β-casein proteins). Cows' milk like this was brought to market by The a2 Milk Company and is s ...

, a trademark of the A2 Corporation * Radio Station A2, a radio station in Lithuania * A-2 tool steel, an air-hardening SAE grade of tool steel * A-2 visa, 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 Washtenaw County, Michigan, United States, and its county seat. The 2020 United States census, 2020 census recorded its population to be 123,851, making it the List of municipalities in Michigan, fifth-most populous cit ...

, 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 Named after 19th century English player Henry Bird, Bird's opening is a standard flank opening. White's strategic ideas involve control of the e5-squa ...

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

stainless steel Stainless steel, also known as inox, corrosion-resistant steel (CRES), or rustless steel, is an iron-based alloy that contains chromium, making it resistant to rust and corrosion. Stainless steel's resistance to corrosion comes from its chromi ...

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 Kingdom of Hungary, Hungarian painter and photographer as well as a professor in the Bauhaus school. He was highly influenced by Constructivism (art), con ...

, 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''

Biology and medicine

Genes and proteins

Medicine

Computing

Electronics

Gaming

Language

Military

Music

Sport

Television

Transportation

Air

Rail

Road

Sea

Space

Tanks

Weapons

Other uses

See also