ATD

ATD may refer to:

Computing and technology

Anthropomorphic test device, also known as a crash test dummy
at (command) or @daemon (spelled "atd", lower case), standard Unix program
Azimuth tractor drive, drive system for tugboats

Medicine and science

1,4,6-Androstatrien-3,17-dione, estrogen inhibitor
Acute tryptophan depletion
Anti-thyroid drugs or antithyroid agent

Other uses

ATD Fourth World
Against the Day, Thomas Pynchon novel
Association for Talent Development, non-profit association
Attention to Detail, defunct British video-game developer
Postal code for Attard, Malta

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