A4
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Template:Wiktionary A4 or A-4 may mean:
- A4, an international standard paper size (210×297 mm) defined by ISO 216.
- The A4 road in England that runs from London to Bristol.
- The A4 motorway in Switzerland that runs from Schaffhausen to central Switzerland.
- The A4 highway in France that runs from Paris to Strasbourg. It is a part of the European routes E50 and E25.
- The Autostrada A4 in Italy that runs from Torino to Trieste (through Milano and Venezia).
- The LNER's Class A4 steam locomotives, including the famous Mallard.
- A4, the actual model number for the German V-2 rocket.
- Audi A4, a brand of car.
- The Douglas A-4 Skyhawk attack aircraft.
- A4, the IATA code for Southern Winds.
- HMS A4, an A-class submarine of the Royal Navy.
- USS A-4, a Plunger-class submarine of the United States Navy.