A21
From Wikipedia, the free encyclopedia
A21, A-21 or A.21 is a three-letter acronym that may refer to:
- A21 road, a major road in England
- Aero A.21, a 1920s-era Czechoslovakian military aeroplane
- One of the Encyclopaedia of Chess Openings codes for the English Opening in chess
- Arrows A21, a Formula One car
- a21, Inc. a United States company
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