on c - orga
- optical landing system
- optical laser
- optical lock on
- optical modulator
- optical navigation system
- optical part
- optical particle decoys
- optical path
- optical path computer
- optical phase modulator
- optical pickoff two axis gyroscope
- optical projected display
- optical propagation
- optical receiver
- optical reflector
- optical reticle
- optical satellite
- optical sensor
- optical sight
- optical sighting system
- optical solar simulator
- optical square
- optical star tracker
- optical system
- optical technology satellite
- optical tracker
- optical tracking
- optical tracking system
- optical transistor
- optical transmitter
- optical unit
- optical wavelength
- optical wedge
- optically focused solar beam
- optically tracked missile
- optico video sensor
- optimal load
- optimal multi impulse rendezvous program
- optimal orbit
- optimal tangential ellipse
