- collective sample
- collector doping
- collimate
- coherence bandwidth
- coherent area
- coherent beam
- coherent cw
- coherent deduction
- coherent detector
- coil antenna
- coil serving
- cold standby
- collator
- collect call
- collimating telescope
- colon sign
- color background
- color gun
- collimation tower
- color head
- color ribbon
- color scanner
- color selection
- colour camera
- colour head
- coloured noise
- coma filter
- combined head
- combined oscillation
- combined parity
- combined station
- command decoder
- command identifier
- command number
- command override
- command profile
- cold trap
- collator node
- collect transfer
- collecting area
- collecting site
- collection efficiency
- collection optics
- collection station
- collective antenna
- collective line
- collimated beam
- color burst
- color menu
- colour film
- colour match
- colour picture
- combination code
- color information
- color noise
- color pattern
- color plotter
- color resolution
- colorimetric parameter
- colour coding
- colour gun
- colour signal
- colour temperature
- colpitts oscillator
- column balancing
- column count
- column separator
- coma lobe
- comb antenna
- comb filtering
- combinational gate
- combined code
- common store
- common trunk
- common volume
- communication software
- communication subsystem
- communication technical
- communication theory
- communication type
- communications
- communications filter
- communications theory
- community
- community antenna
- community installations
- community receiver
- commutation circuit
- commutator
- commercial amplifier
- common antenna
- common cable
- common equipment
- common highway
- common storage
- communication cable
- communication compartment
- communication computer
- communication element
- communication identifier