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A4

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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

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Computing

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Medicine

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Transportation

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Aeronautics and astronautics

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  • 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

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Ships

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  • 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

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Roads and routes

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Military

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Other uses

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See also

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