- dark field
- dashed curve
- data cable
- data card
- data comparator
- data compression
- data connector
- data content
- data extraction
- data item
- data manipulation
- data path
- data port
- data security
- data sequence
- data sorting
- daughterboard
- DC amplification
- de-tank
- definite quantity
- definition statement
- deflection factor
- deflection sensitivity
- delay characteristic
- delay factor
- delay gate
- delay maintenance
- delayed channel
- delayed feedback
- delete right
- deleted record
- delivery pressure
- delivery roller
- delivery wheel
- delta loop
- debug facility
- decadent wave
- decay rate
- decentralized system
- decimal box
- decimal feature
- decimal instruction
- decoder network
- decollation
- deconvolution
- decoupling
- dedicated port
- deep diffusion
- deferred step
- defined operation
- deflector
- degradation failure
- decametric wave
- decca chain
- decimal base
- decimal data
- decipher
- deciphering key
- decomposition
- decontaminate
- dedicated circuit
- deep space
- defected list
- deferred print
- Deflator
- defocusing
- delay component
- delay equalizer
- delay processing
- delay slot
- delayed call
- demand processing
- demodulating oscillator
- demodulation
- demodulation process
- demodulator threshold
- demux
- depacketizer
- dependency rate
- dependent child
- depermed
- depletion mode
- depressed horizon
- derivation rule
- derivative module
- descending node
- descramble
- description list
- design data
- design loads
- desired signal
- destination centre
- detail calculation
- detected signal
- detection mode
- detuning
- developing process
- device file
- device flag
- device priority