digi - door
- digifant
- digifant II
- digital caliper
- digital frequency control
- digital fuel injection
- digital ratio adapter controller module
- digital speedometer
- digital volt-ohm multimeter
- diluent
- dilution
- dimmer
- dimmer control
- dimmer switch
- DIN
- DIN mounting
- DIN radio
- dinging
- Dino
- diode
- Dion axle
- dioxide
- dip
- dip treatment
- dipped beam
- dipper
- dipper switch
- dipping mirror
- dipstick
- dipswitch
- direct current
- direct damage
- direct digital control
- direct drive
- direct drive powertrain
- direct expansion evaporator
- direct ignition system
- direct injection
- direct polarity
- direct-acting shock absorber
- direction indicator
