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A2

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

Biology and medicine

British NVC community A2 (Lemna minor community), 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, 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
Annexin A2, a protein
Apolipoprotein A-II, a protein
Phospholipase A2, an enzyme
Prokaryotic phospholipase A2, an enzyme
Hemoglobin A2, a protein
Proanthocyanidin A2, an A type proanthocyanidin
Urea transporter A2, a protein
A2, a variant of blood groups alleles A in the ABO blood group system
A2, a subfamily of rhodopsin-like receptors

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

Computing

A-2 (programming language), a follow-on to the A-0 System used on UNIVAC I
A2 (operating system), software to run a computer

Electronics

DiMAGE A2, a digital camera produced by Minolta
IBM A2, an IBM processor used in its supercomputers
Cowon A2, a portable multimedia player from Cowon

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
A2, a level in the Common European Framework of Reference for Languages

Military

A-2 jacket, a leather flight jacket
A2, the military staff designation in the continental staff system for air force headquarters staff concerned with intelligence and security
A 2, Göta Artillery Regiment designation, a former Swedish Army artillery regiment

Music

A due, a musical term often abbreviated to a2
A2, a rock band that performed the song "Chosen One" in the video game Shadow the Hedgehog

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
A2, an Italian Volleyball League
A2, a grade in climbing

Television

A2 (remote television production), a person who manages audio equipment
A2 Stereo or Zweikanalton, 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, 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, a design study for a hypersonic airliner under development
Cielos Airlines's IATA code
A-2, United States Navy alphanumeric code for the North American AJ Savage carrier-launched bomber
A2, a Botswana aircraft registration code

Rail

Bavarian A II, an 1847 German steam locomotive model
LNER Class A2, a class of steam locomotives
LNER Peppercorn Class A2, 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, a 1907 Australian steam locomotive
PRR A2, a Pennsylvania Railroad locomotive classification
Prussian A 2, a Prussian railbus model

Road

List of A2 roads
Anadol A2, a 1970 Turkish car
Arrows A2, a 1979 British racing car
Audi A2, 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

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

Tanks

M1A2, a version of the American M1 Abrams tank
M60A2, a version of the American M60 Patton tank

Weapons

A2 (rocket), a German rocket design (1934)
AUG A2 Commando, a variant of the Austrian Steyr AUG rifle
M16A2 rifle, a variant of the M16 rifle of the United States Army
AR-15A2, a variant of the Colt AR-15 rifle
M16A2 mine, a variant of the M16 mine of the United States Army
Polaris A-2, a variant of the Polaris missile of the United States Navy

Other uses

A2 (theater), 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, 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 (AII), a French governmental agency for technological projects
Ann Arbor, Michigan, often referred to as A2 or A²
Bird's Opening's Encyclopaedia of Chess Openings code
A2, an international standard paper size
A2 or SAE 304, a grade of stainless steel for fasteners
A2, a UK Town and Country Planning use class
A II, a painting by László Moholy-Nagy, 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

A2