obiectum (SAUS)
Obidos - Brazil - Airport symbol (AD)
Obihiro - Japan - Seismograph station code, US Geological Survey (SEIS)
Obispeno - Language code (ETLW)
Obligated Involuntary Officer - Military
Obliterate (SAUS)
O'Brien International - NCIC boat manufacturer code (NCIC)
O'Brien International Inc., Redmond, WA - Manufacturer code for watercraft hull identification number (USCG)
O'Brien Rifle Co. - NCIC firearms make code (NCIC)
Office du Baccalaureat International - International Baccalaureate Office - IBO (EAIO)
Office of Basic Instrumentation - National Bureau of Standards
Old Babylonian Inscriptions - A publication (BJA)
Omnibearing Indicator - Radio
Online Book Initiative - Trademark name - Internet
Open-Back Inclinable
Open-Back Inclinable Press - Manufacturing term
Open Buying on the Internet - Computer science
Operation Blessing International - An association
Optical-Beam-Induced (SAUS)
Order of British India
Organisation du Baccalaureat International - International Baccalaureate Organisation - IBO (EAIO)
Osaka Bioscience Institute - Japan
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