Austria - International civil aircraft marking (ODBW)
Exeter Public Library, Ontario - Library symbol - National Library of Canada (NLC)
Occupied by Enemy (SAUS)
Oceanic Engineering (SAUS)
OE, Inc. - Toronto Stock Exchange symbol
Offensive End - Football
Office Equipment
Office of Education - HEW
Office of Emergency Planning and Operations (SAUS)
Office of Energy - Department of Agriculture (GFGA)
Office of Enforcement - Environmental Protection Agency (GFGA)
Oil Emulsion - Microbiology
Oil Equivalent
Old England (GEAB)
Old English - Typeface (WDMC)
Old English - Language, etc. - i.e., before 1150 or 1200
Old Etonian - British
Olpe - German license plate city code
Omission Excepted (IAA)
One Edge (SAUS)
On Examination - Medicine
Opened Edges - Publishing (DGA)
Open Edition (SAUS)
Open End (MSA)
Operating Engineer (NRCH)
Operating Environment (CTAS)
Operating Expense
Operational Efficiency (SAUS)
Operational Evaluation - Army
Operation Enterprise - Hamilton, NY (EA)
Operation Enterprise Newsletter - A publication
Operations Engineering (AAG)
Opportunity Evaluation (SAUS)
Optical/Electrical Conversion - Telecommunications
Optical Emission (MCD)
Optical Engineering
Optoelectronics (SAUS)
Orbital Engine ADS - NYSE symbol (SPSG)
Order Entry (DMAA)
Ordnance Electrician - British military (DMA)
Ordnance Engineer - British military (DMA)
Oregon Electric Railway Co. - AAR code
Organizational Effectiveness
Organizational Entity
Organizational Error - Engineering
Organo Espressivo - Swell Organ - Music
Orientalium Ecclesiarum - Decree on the Eastern Catholic Churches - Vatican II document
Original Entry - Computer science
Original Equipment - Automobile industry
Original Error - Navigation
Originating Exchange (SAUS)
Orion Express - Federal Railroad Administration identification code
Orthoenstatite - Mineral
Orthopedic Examination (SAUS)
Other Essays - Literature (ROG)
Otitis Externa - Medicine (DMAA)
Out Island Airways (OAG)
Outlook Express - Computer science
Output Enable - Semiconductor memory (IEEE)
Overrun Error (SAUS)
Over-the-Horizon Expanded (MCD)
Own Exchange - Telecommunications (TEL)
Oxide Electrode (SAUS)
Samoan - ICAO designator (AD)
Oersted - Unit of magnetizing intensity
Oersted (AD)
Omissions Excepted (WDAA)
Omissions Expected (AD)
Open End (AD)
Organizational Effectiveness (AD)
Organo Espressivo - Swell Organ - Italian (AD)
Outdoor Education (AD)
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