- call flow
- call handling
- call interception
- call logging
- call privacy
- call processing
- call trace
- calling line
- calling sequence
- canal offtake
- cancellation pattern
- canceller
- cancel indicator
- canted fin
- capacitor antenna
- capital cost
- Capital gain
- capital letter
- capsule
- capture
- capture area
- capture key
- car receiver
- capital supply
- car reception
- carcinotron
- card code
- card feed
- card jam
- card loader
- card printer
- card track
- cardioid pattern
- carbon dioxide
- card image
- card module
- card phone
- card punch
- card reader
- card scanner
- card sorting
- cardfile
- cardioid microphone
- cartridge
- cartridge disk
- cartridge label
- cascade button
- cascade mode
- cascaded circuits
- Cash flow
- cash loss
- cassette recorder
- carriage control
- carrier acquisition
- carrier bandwidth
- carrier channel
- carrier code
- carrier cycle
- carrier deviation
- carrier filter
- carrier frame
- carrier generation
- carrier generator
- carrier indicator
- carrier leak
- carrier modulation
- carrier multiplication
- carrier noise
- carrier power
- carrier reduction
- carrier regeneration
- carrier replenishment
- carrier signal
- carrier signaling
- carrier source
- carrier suppression
- carrier system
- carrier traffic
- carrier voltage
- carry
- carry time
- carry-over
- cascade amplifier
- cascade connection
- cascade operation
- cash surplus
- casual connection
- catalog directory
- catalog index
- catalog view
- catalogue record
- catalogued file
- catcher
- catcher cavity
- catcher space
- cavity coupling
- cavity oscillator
- cavity resonance
- cavity slystron
- CCD diode