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
A sonic boom is the loud sound created by the shock waves ...
A flight condition wherein the airflow separates from the ...
A movable horizontal airfoil, usually attached to the ...
Also called drones over U.S., surveillance society is a ...
Jetman, a nickname for Swiss adventurer Yves Rossy, who can ...
Deutsche Lufthansa commonly known as Lufthansa, is the flag ...
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