O
- O&M
- O2
- O2O
- O4U
- OA
- OA&M
- OaaS
- OADM
- OAI
- OAM
- OAM cell
- OAM&P
- OASIS
- OATH
- OAuth protocol
- OBA
- OBC
- Oberon
- OBEX
- obfuscation
- obfuscator
- OBI
- OBJ
- object
- object animation
- object architecture
- object avoidance
- object browser
- object classification
- object code
- Object Code Insertion
- object computer
- object constructor
- object conversion
- object coordinate system
- object data type
- object database
- object description
- object detection
- object diagram
- object domain
- object file
- object file header
- object format
- object handler
- object header
- object identifier
- object identity
- object interface
- object language
