AT-3 may be:
*
AT III, a protein in the coagulation system that is activated by Heparin
*
AT-3 (jet trainer)
The AIDC AT-3 Tzu Chung ( zh , c= 自強 , p= Zìqiáng; "Self Reliance") is an advanced jet trainer operated by the Republic of China Air Force (ROCAF). A total of sixty-two aircraft were manufactured by the Aerospace Industrial Development C ...
of the Republic of China Air Force (Taiwan)
*
AT-3 plane, Very Light Aircraft
*
AT-3 Sagger
The 9M14 Malyutka (; "Little one", NATO reporting name: AT-3 Sagger) is a manual command to line of sight (MCLOS) wire-guided anti-tank guided missile (ATGM) system developed in the Soviet Union. It was the first man-portable anti-tank guided mi ...
, Soviet anti-tank missile
* AT-3 (
MATH-MATIC
MATH-MATIC is the marketing name for the AT-3 (Algebraic Translator 3) compiler, an early programming language for the UNIVAC I and UNIVAC II.
MATH-MATIC was written beginning around 1955 by a team led by Charles Katz under the direction of Gra ...
) compiler for UNIVAC mainframe computers
* .at3, extension for audio files compressed with Sony's
ATRAC3
Adaptive Transform Acoustic Coding (ATRAC) is a family of proprietary audio compression algorithms developed by Sony. MiniDisc was the first commercial product to incorporate ATRAC, in 1992. ATRAC allowed a relatively small disc like MiniDisc to ...
algorithm
* ''
Ar tonelico Qoga: Knell of Ar Ciel'', a role-playing game for the PlayStation 3
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