O
- ODIF
- ODL
- ODM
- ODMA
- ODMG
- ODN
- odometer
- odometry
- odour sensor
- ODRA
- ODS
- ODSP
- ODU
- ODVA
- OE
- OEC
- OECD
- OED
- OEE
- OEIC
- OEL
- OEM
- OEM product
- OEMMIC
- OEO
- OER
- oersted
- OES
- OF
- of interest
- OFA
- OFB
- OFC
- OFDM
- OFDMA
- off
- off mode
- off period of the clock
- off position
- off-axis illumination
- off-board
- off-board navigation
- off-by-one error
- off-chip
- off-chip memory
- off-diagonal
- off-duty factor
- off-hook
- off-line attack
- off-line BIST
