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 Boeing 747-8 Intercontinental is a wide-body commercial ...
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A double-deck, wide-body, four-engine jet airliner ...
One of the elements that constitutes an airplane, the ...
A proposed law that bans cell phone conversations during ...
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