PD - Wikipedia
https://en.wikipedia.org/wiki/PD
PD resistor, a pull-down resistor; Pd test, the outcome of using a drop of para-phenylenediamine (also abbr. "Pd") to identify lichens; Palladium (symbol Pd), a chemical element; Point-defence, a category of weapons; Axiom of projective determinacy, in mathematical logic; Pumpe Düse, a Volkswagen Group name for Unit Injector diesel engine ...
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