O

• O.D. - Oculus Dexter
• O.D. - OverDose
• O.S. - Oculus Sinister
• OAIS - Open Archival Information System
• OC - Optical Carrier
• OCA - Object Content Architecture
• OCR - Optical Character Recognition
• OCX - Object Linking and Embedding control
• ODA - Office Document Architecture
• ODBC - Open Database Computing Driver
• ODI - Open Data-Link Interface
• ODIF - Office Document Interchange Format
• ODR - Operational Data Store
• OEBPS - Open EBook Publication Structure
• OEIC - Opto-Electronic Integrated Circuit
• OEM - Original Equipment Manufacturers
• OGTT - Oral glucose tolerance test
• OH - OverHead
• OHA - Open Handset Alliance
• OLAP - Online Analytical Processing
• OLE - Object Linking and Embedding
• OLEBD - Object Linked Embedded Database
• OLTP - Online Transaction Processing
• OLTS - Optical Loss Test Sets
• OMG - Object Management Group
• OMT - Object Modeling Technique
• ONI - Optical Network Interface
• OPC - Originating Point Code
• OPEX - OPerating EXpenditure
• OPT - Open Packet Telephony
• OPX - Off-Premises Extension
• ORB - Object Request Broker
• ORG - Organization
• OS - Operating System
• OSI - Open Source Initiative
• OSI - Open Systems Interconnection
• OSI-CS - OSI Communication Subsystem
• OSI-FS - OSI File Services
• OSI-RM - OSI Reference Model
• OSI-TP - OSI Transaction Processing
• OSIE - OSI Environment
• OSPF - Open Shortest Path First
• OSPM - Operating System-Directed Power Management
• OSR2 - Operating System Release 2 - Microsoft Windows 95
• OSS - Operations Support System
• OTDR - Optical Time Domain Reflectometer
• OTS - OSI Transport Services
• OU - Organization Unit
• OUTWATS - Outgoing Wide-Area Telephone Service