odd - oper
- odd harmonic
- odd line
- odd subharmonic
- odjacent channel frequency
- off state
- off time
- off transistor
- off-air
- off-axis feed
- off-duty factor
- off-line control
- off-line equipment
- off-line mode
- off-line operation
- off-line output
- off-line processor
- off-line system
- off-network channel
- off-peak traffic
- off-standard quality
- off-system unit
- off-the-shelf equipment
- off-the-shelf ic
- off-the-shelf radio
- offer a control service
- offer simulation technique
- offhook status
- office
- office telephone
- office terminal
- offset
- offset axis
- offset beam
- offset feed
- offset psk
- offset-fed reflector
- ohm connector
- ohm load
- ohm's law
- ohmic loss
