Other
- Axiom of projective determinacy
- Period, American English for "full stop", as used in coded military communication (e.g., WWII)
- Peu difficile, a French climbing/mountaineering grade
- Phase-change Dual, an optical media format
- Phelps Dodge a former American mining company, now part of Freeport-McMoRan.
- Phenyldichloroarsine, a blister agent
- The Plain Dealer, Cleveland, Ohio, USA newspaper
- Point-defence as a prefix for weapons
- Porter Airlines (IATA airline designator)
- Post Diaspora, in the Honorverse series of science fiction novels
- Principia Discordia, a holy text in Discordianism
- Privatdozent, title/position especially in the German university
- Production diary, in film-making
- Pumpe Düse, a Volkswagen Group name for Unit Injector diesel engine technology
- Pushing Daisies, an American Broadcasting Company television show
- A Postdoctoral Research position; a "post-doc".
- Production designer, in film or television
- Parkway Drive, an Australian Metalcore band
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