diff - disc
- difference
- difference arm
- difference equation
- difference in level
- difference of potential
- different levels
- differential
- differential ammeter
- differential arc regulator
- differential equation
- differential expansion
- differential gap
- differential of limit switch
- differential phase shift
- differential pressure control
- differential pressure gage
- differential pressure indicator
- differential pressure switch
- differential protective system
- differential transformer
- differential transformer transducer
- differentiating section
- diffuse pinch
- diffuse reflection
- diffuser
- diffusing screen
- diffusion barrier
- digital ammeter
- digital automatic voltage regulator
- digital clamp tester
- digital communication
- digital control
- digital control system
- digital display
- digital electrohydraulic control system
- digital feedback
- digital frequency meter
- digital panel meter
- digital recorder
- digital servosystem
