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Meanings and definitions for A4
What does A4 stand for? What does A4 mean?
- A4 most often refers to:
- A4 paper, a paper size defined by the ISO 216 standard, measuring 210 × 297 mm
- British NVC community A4 (Hydrocharis morsus-ranae - Stratiotes aloides community), one type of Aquatic communities in the British National Vegetation Classification system
- Combretastatin A-4, a stilbenoid chemical compound
- A4, the alternating group on four elements
- A4, a type of stainless steel, as defined by ISO 3506, equivalent to SAE steel grade 316L
- Subfamily A4, a rhodopsin-like receptors subfamily
- ATC code A04 Antiemetics and antinauseants, a subgroup of the Anatomical Therapeutic Chemical Classification System
- Lipoxin A4, a lipoxin
- Androstenedione, an androgen steroid hormone
- "A-4 Helldiver", the civil version of the Curtiss Falcon an attack aircraft manufactured by Curtiss Aircraft Company
- Douglas A-4 Skyhawk, a 1954 attack aircraft manufactured by Douglas Aircraft Company
- Breda A.4, a 1926 Italian biplane trainer aircraft
- Aggregat-4, the technical name for V-2 ballistic missile
- A4, Southern Winds Airlines, the defunct Argentine airline, as its IATA code
- A4, Azimuth (airline), as its current IATA code
- A-004, the sixth and final abort test of the Apollo spacecraft
- S.A-4 or A.4, 1915 French reconnaissance fighter built by SPAD
- Bavarian A IV, an 1852 German steam locomotive model
- LNER Class A4, a class of steam locomotives, including the famous Mallard
- PRR A4, an American Pennsylvania Railroad locomotive classification
- Togoshi Station, number A-04 on the Toei Asakusa Line
- A-4, USS Moccasin (SS-5), a Plunger-class submarine of the United States Navy, which was renamed A-4 on 17 November 1911
- HMNZS Kahu (A04), a 1978 Royal New Zealand Navy Moa class inshore patrol vessel
- HMS A4, an A-class submarine of the Royal Navy
- Belgian ship A4, a Belgian naval patrol vessel of World War II
- Audi A4, a luxury compact executive car manufactured by Audi, introduced in 1994
- Arrows A4, a 1982 British racing car
- Prussian A 4, a 1913 German railbus
- List of A4 roads
- A4, a Metrobus route in Washington, D.C.
- A4, the model number of the World War II-era German V-2 rocket
- A4, the designation for air force headquarters in the NATO continental staff system concerned with logistics
In the United Kingdom, the A4 Air Logistics branch of the Joint Force Air Component Headquarters
- A 4, see List of Swedish regiments for A4, a Swedish designation (4th Artillery Regiment) that has been used by:
Gotlands artilleriregemente (unknown–1892)
- Norrlands artilleriregemente (1893–1997)
- Douglas A-4 Skyhawk, an American attack aircraft introduced in 1956
- M16A4, a variant of the American M16 rifle
- Leopard 1A4, a variant of the German Leopard 1 main battle tank
- Leopard 2A4, a variant of the German Leopard 2 main battle tank
- Apple A4, a microprocessor used in some Apple products
- AMD A4, a microprocessor
- A4 or A4, the musical note La or A in the fourth octave
- A440 (pitch standard), the use of the musical note A to reference musical pitch
- A04, Encyclopaedia of Chess Openings code for Réti Opening
- A4, a grade (climbing)
- A4, the code for permission to use specific land or premises for pubs and bars in town and country planning in the UK
- A4 Pod, a family of killer whales living in British Columbia coastal waters
- A4, a 1981 component for the Scourge of the Slave Lord adventure in the Dungeons and Dragons role playing game
- Biu-Mandara A.4 languages, a family of languages spoken in Cameroon and Nigeria
- 4A Engine, a video game engine developed by 4A Games
- 4A Games, a video game development company in Ukraine
- Air Kiribati's IATA designator
- Ararat International Airlines' IATA airline designator
- Calabarzon or Region IV-A, a province in Philippines
- Vermont Route 4A
- Toyota A engine 4A Produced by Toyota Motor Corporation (1982-2002)
- 4A, the production code for the 1974–75 Doctor Who serial Robot
- 4A/OP, a radiative transfer model for the infrared
- Long March 4A, a Chinese rocket
- Stalag IV-A, a German prisoner of war camp
- Texas Instruments TI-99/4A, a 1981 home computer
- Adam4Adam, a gay dating service
- Airlines for America, an industry association in the United States
- Apps4Africa, an African innovation accelerator
- Aimco, NYSE symbol AIV, an American operator of apartment communities
- AIV fodder, a kind of acidified silage
- George Downer Airport (IATA: AIV) serving Aliceville, Alabama, USA
- Panoz AIV Roadster, an American automobile
- Angiotensin IV (angiotensin 4)
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