on c - orga
- on the line pump station
- on the pad escape
- onboard battery
- onboard computer complex
- onboard digital computer
- onboard measurement system
- onboard panel
- onboard pilot observer camera
- onboard power source
- onboard team
- ondulator
- one axis gyroscope
- one axis stabilization system
- one by nine pattern
- one component system
- one core per bit circuit
- one day mission
- one deck bunk
- one engine out capability
- one for one principle
- one gimbal gyroscope
- one hundred per cent rectangle
- one hundred per cent zone
- one impulse transfer
- one line bridge
- one man propulsion device
- one man tank
- one man turret
- one orbit period rendezvous
- one piece cast armor steel turret
- one piece cast steel armored body
- one piece chamber
- one piece construction
- one piece forged
- one quarter deflection
- one rail single car retarder
- one shot device
- one shot flame thrower
- one shot mode
- one side character of bulge
