OR e - pagi
- OR element
- OR function
- OR gate
- OR operation
- OR relation
- OR-ELSE
- OR-ELSE circuit
- oral control
- Orange Book
- orbital altitude
- orbital hight
- orbital inclination
- orbitally semistable limit cycle
- orbitally stable limit cycle
- orbitally unstable limit cycle
- orbiting satellite
- orbiting technological satellite
- order
- order and service by telephone
- order card
- order code
- order cut
- order number
- order of calls
- order of error
- order of harmonics
- order of interference
- order of magnitude
- order of magnitude increase
- order of reflection
- order of spectrum
- order processing
- order receipt
- order signal
- order stock
- order wire
- order-wire button
- order-wire distributor
- order-wire jack
- order-wire junction
