- d-
- da-
- DA
- DAC
- DAM
- D-AMPS
- DAO
- Dark Current or Dark Noise
- Darlington Pair
- DAT
- dB
- DBS
- DB-25
- DB-9
- DC
- DCC
- DCS
- DCS-1800
- DCS-1900
- deci- (d-)
- Decibel (dB)
- Decoder
- Decompression
- DECT
- Deep Discharge
- DEH15
- deka- (da-)
- Demodulation
- Depth of Field
- Depth Penetration
- Detection Pattern
- Detuning
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- Device
- Dew
- Dew Point
- Diac
- Dielectric
- Dielectric Constant
- Dielectric Strength
- Dighole
- Digital
- Digital Advanced Mobile Telephone Service
- Digital to Analog Converter
- Digital Modulation
- Diaphragm
- Digital Audio
- Digital Coax
- Digital Video
- Digital Zoom
- Digitization
- Dimmer
- DIN Connector
- Diode
- Diode Logic
- Diode, Schottky
- Diode, Surface-barrier
- Diode-Transistor Logic
- Diode, Zener
- Diopter Correction
- DIP
- Dipole
- Diplexer
- Direct Current
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- Directional
- Direct Vision
- Discharge Curve
- Discharge Rate
- Discone
- Discrimination
- Discriminator, Mineral Free
- Discriminator, Motion
- Dish
- Dish Network®
- Dispatch Calls
- Distortion
- (diT/dt)cr
- DL
- DMCA
- DMM
- DNS
- Dolby® Digital
- Dolby® Stereo
- Dolby® Surround
- Dolby® Pro Logic®
- Dome
- Doppler Shift
- DSL
- Double D
- Downlink
- Download
- DPDT
- DPI
- DPOF
- DPST
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- Drain
- DRAM
- DRAM Buffer
- Drift
- Driver
- Drizzle
- Drizzle, Freezing
- DRM
- Dry Bulb Thermometer
- Dry Cell
- D-Shell Connector
- DSD
- DSL
- DSP
- DTH
- DTL
- DTMF
- DTS Digital Surround
- DTV
- Dual-conversion
- Dual In-line Package
- DV
- DVD
- (dvD/dt)cr
- DX, DXing
- Dye Sub
- Dynamic Range
- Dyne
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