A1
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A1 or A-1 can mean:
- A1, a symbol indicating shipbuilding quality, originally in the shipping list at Lloyds of London.
- The highest degree of excellence (from the meaning in shipping).
- a1, a British boy band.
- A1, milk containing a protein supposed by some to cause heart disease.
- A1, the primary auditory cortex, that is, the part of the brain processing hearing.
- A1, a brand of steak sauce.
- A1, a German rocket design from the 1930s.
- A1, an international standard paper size (594×841 mm), defined in ISO 216.
- HMS A1, an A-class submarine of the Royal Navy.
- USS A-1, two vessels of the United States Navy.
- The A-1 Skyraider, a USAF single-seat attack bomber.
- A-1 is Battle Angel Alita's nickname on her Tuned days.
- A1, in the UIC classification for railway locomotive wheel arrangements, is equivalent to 0-2-2 in the Whyte notation.
- A1 is a television channel in Macedonia.
- A-1 is a professional wrestler.
There are several roads and freeways named A1:
- A1 freeway (Austria)
- A1 road (Britain) from London to Edinburgh
- A1 freeway (Cyprus)
- A1 freeway (France) from Paris the Belgian border
- Bundesautobahn 1 in Germany (signed without the A)
- A1 road (Italy) from Milan to Naples
- A1 highway (Lithuania) from Vilnius to Klaipėda
- A1 road (Northern Ireland) from Belfast to Newry
- A1 freeway (Poland)
- A1 freeway (Romania)
- A1 freeway (Spain)
- A1 (Switzerland)
- A1 road Isle of Man
- A1 Ring is the name of a race track in Austria which formerly hosted a round of the Formula One championship.