- device symbol
- device table
- diagnostic antenna
- diagram board
- density matrix
- dependent exchange
- derivative absorption
- descambler
- description language
- despin antenna
- despun antenna
- destination exchange
- destructive read
- detail card
- detection range
- dial set
- dialing code
- dialing period
- dialing speed
- dialling period
- dichroic mirror
- dielectric capacitance
- difference engine
- difference frequency
- depreciation
- derotation equipment
- descrambling
- desensitization threshold
- design point
- design value
- designer
- destination code
- detectable element
- detector stage
- deterministic value
- development launches
- developmental satellite
- deviation measurement
- device dependence
- device status
- dial exchange
- dial line
- dial pulse
- dial-out
- dialing automatically
- dialing signal
- dialling error
- dialog box
- dialogue procedure
- dichroic surface
- dielectric antenna
- dielectric charge
- dielectric slab
- differential mode
- differential time
- diffracted component
- diffracted signal
- diffraction edge
- diffraction pattern
- diffraction region
- diffuse image
- diffused photodiode
- diffusion function
- digit counter
- digit pulse
- digit selection
- digit selector
- digital adder
- digitization
- digitized image
- digitized signal
- digitized speech
- digitizing rate
- dimension specification
- dimension statement
- Diminishing returns
- diode
- diode amplifier
- diode array
- diode characteristic
- diode crosspoint
- diode gate
- diode laser
- diode logic
- diode mixer
- diode modulation
- diode modulator
- diode oscillator
- diode rectifier
- diode string
- diode suppression
- diode suppressor
- diode tester
- diode theory
- diode thyristor
- diode triode
- diode voltage
- dip equator
- derived field
- descending wave