What does ALT stand for?

ALTernate key

Automatic Link Transfer

Accelerated Life Test

Any set of test conditions designed to reproduce, in a short time, the deteriorating effect obtained under normal service conditions.

approach and landing test

Armoured Launching Turret

Airborne Link Terminal

Altimeter

An instrument used to measure the height above a reference point, such as ground or sea level. An instrument, most usually an aneroid barometer, calibrated in meters and/or feet, to indicate an aircraft's height. A device that measures altitude above the surface of a planet or moon. Spacecraft altimeters work by timing the round trip of radio signals bounced off the surface.

Algorithmic Learning Theory

Association for Learning Technology

Anarchists, Lunatics and Terrorists