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A4 in Wiktionary, the free dictionary.
A4 commonly refers to:
A4 paper , a paper size defined by the ISO 216 standard, measuring 210 × 297 mm
A4 and variants may also refer to:
Science and technology
Computing
Medicine
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
Southern Winds Airlines (IATA code: A4), a defunct Argentine airline
Azimuth (airline) (IATA code: A4), a Russian airline
A-004 , the sixth and final abort test of the Apollo spacecraft
SPAD S.A-4 , 1915 French reconnaissance fighter built by SPAD
Railways
Ships
USS A-4 (SS-5) , a Plunger -class submarine of the United States Navy
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
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
Réti Opening (Encyclopaedia of Chess Openings code: A04)
A4, a climbing route
grade
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 , the 2022 COVID-19 protests in China
See also