Academy of Medicine, Toronto, Ontario - Library symbol - National Library of Canada (NLC)
Congressional Office of Technology Assessment (SAUS)
Ixtenco Otomi - Language code (ETLW)
Mota - Ethiopia - Airport symbol (AD)
Occupational Therapists Association (NADA)
Occupational Therapy Assistant (IDYL)
Occupied Territory Administration - World War II
Office of Tax Analysis - Department of the Treasury
Office of Technical Assistance (USGC)
Office of Technology Assessment - Defunct - Congressional study group - Washington, DC
Office of Technology Assistance - General Services Administration
Office of Telecommunications Applications - US National Telecommunications and Information Administration (TSSD)
Office of Territorial Affairs (SAUS)
Officer Training Allowance - Naval Reserve
Official Test Aerosol (SAUS)
Off-the-Air Record Club - Record label
Oil Trades Association of New York (EA)
Old Testament Abstracts - A publication (BJA)
Omnidirectional Transmitter Antenna
Ontario Trucking Association (SAUS)
Open Technology Assembly
Open Terminal Architecture (RALS)
Open Test Assembly - Nuclear energy (NRCH)
Operational Test Agency (DOMA)
Operational Transconductance Amplifier (IEEE)
Operational Transconductance Array (SAUS)
Operation Town Affiliations - An association (EA)
Operation-Triggered Architecture - Computer science
Optical Telescope Assembly - NASA
Optical Tracking Aid - Deep Space Instrumentation Facility, NASA
Organic Trade Association
Organisation Mondiale du Tourisme et de l'Automobile - World Touring and Automobile Organization
Ornithine Transaminase (DB)
Orthodontic Technicians Association - British (DBA)
Orthopaedic Trauma Association (SAUS)
Ortho-Tolidine Arsenite - Organic chemistry
Other Talk Address (IAA)
Other than Air (CINC)
Outer Transport Area
Output Transformerless Amplifier (DICI)
Outside-Wheel Turning Angle - Automotive engineering
Ovarian Tumor-Associated Antigen - Medicine (MELL)
Overflight Top Attack (SAUS)
Over-the-air - Television technology
Oxford Text Archive - Digital text archive (AHDS)
U. S. Congress Office of Technology Assessment (SAUS)
Ottoman Turkish - MARC language code - Library of Congress (LCCP)
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