Editing AT-3

'''AT-3''' may be:

* [[Antithrombin|AT III]], a protein in the coagulation system that is activated by Heparin
* [[AT-3 (jet trainer)]] of the Republic of China Air Force (Taiwan)
* [[Aero AT-3|AT-3 plane]], Very Light Aircraft
* [[AT-3 Sagger]], Soviet anti-tank missile
* AT-3 ([[MATH-MATIC]]) compiler for UNIVAC mainframe computers
* .at3, extension for audio files compressed with Sony's [[ATRAC3]] algorithm
* ''[[Ar tonelico Qoga: Knell of Ar Ciel]]'', a role-playing game for the PlayStation 3

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