open - OTDR
- open application interface
- open architecture
- open document architecture
- Open Financial Exchange
- open shortest path first
- open system
- Open Systems Interconnect (OSI) layer 1
- Open Systems Interconnect (OSI) layer 2
- Open Systems Interconnect (OSI) layer 3
- Open Systems Interconnect (OSI) layer 4
- Open Systems Interconnect (OSI) layer 5
- Open Systems Interconnect (OSI) layer 6
- Open Systems Interconnect (OSI) layer 7
- Open Systems Interconnect (OSI) model
- OpenDoc
- operating system
- operating time
- operator
- operator distance dialing
- operator number identification
- operator-assisted calls
- OPI
- OPS
- optical character recognition
- optical disk
- optical disk storage and retrieval
- optical fiber
- optical scanner
- optical storage
- optical time delay reflectometer
- OPX
- OR
- ORB
- orbit, subsynchronous satellite
- orbit, synchronous satellite
- orientation
- original equipment manufacturer
- originate only
- originating restriction
- OS
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