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
The wild speculations and conspiracy theories that ...
A movable horizontal airfoil, usually attached to the ...
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A highly maneuverable fighter plane used during World War I ...
Anti-collision lights are flashing light assemblies ...
A new Lockheed Martin concept plane that is able to fly up ...
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