A4
A4 most often refers to:
- A4 paper, a paper size defined by the ISO 216 standard, measuring 210 × 297 mm
Look up A4 in Wiktionary, the free dictionary.
A4 and variants may also refer to:
Science and mathematics
- 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
Medicine
- ATC code A04 Antiemetics and antinauseants, a subgroup of the Anatomical Therapeutic Chemical Classification System
- Lipoxin A4, a lipoxin
- Androstenedione, an androgen steroid hormone
Transportation
Aeronautics and astronautics
- "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
Railways
- 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
Ships
- 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
Other vehicles
Roads and routes
Military
- 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
Computing
- Apple A4, a microprocessor used in some Apple products
- AMD A4, a microprocessor
- Samsung Galaxy A04, a smartphone manufactured by Samsung Electronics
Other uses
- A4 (classification), an amputee sport classification
- 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
- Vlad A4, Belarusian YouTuber
- A4 Revolution, a name for the 2022 COVID-19 protests in China
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