It's shorthand for above sea level. A term generally used to define how the top on Earth is to a certain position.
00:46, 15 January 2013
Currently the world's largest jetliner, the Airbus A380 is ...
A highly maneuverable fighter plane used during World War I ...
Front edge of wing, rotor, tail or other aerofoil.
Rear edge of aerofoil or streamlined strut.
A highly accurate tachometer that shines a laser beam on ...
The Boeing Company is an American multinational corporation ...
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