PD

PD, P.D., or Pd may refer to:

Political parties

• Democratic Party of Albania (Partia Demokratike)
• Democratic Party (Indonesia) (Partai Demokrat)
• Democratic Liberal Party (Romania) (Partidul Democrat)
• Democratic Party (Italy) (Partito Democratico)
• People's Democracy, a defunct political organization in Ireland
• Progressive Democrats, political party in the Republic of Ireland
• Democratic Party – demokraci.pl (Partia Demokratyczna – demokraci.pl), Poland

Publications

• People's Democracy (Journal), Weekly Organ of the Communist Party of India (Marxist)

Physical sciences

• Palladium (chemical element symbol)
• Partial discharge, an undesirable discharge phenomenon in high voltage dielectrics
• Photodiode
• Potential difference (voltage)

Medicine

• Cell surface protein PD-1
• Paleolithic diet, a diet based on presumed ancient diet
• Parkinson's disease, a degenerative neurological condition
• Peritoneal dialysis
• Personality disorder
• Physical Diagnosis, a course in Medical School
• Polydipsia
• Progressive disease, oncology term
• Pupillary distance in optometry

Computer programs

• Perfect Dark (P2P), a Japanese peer-to-peer file-sharing (P2P) application designed for use with Microsoft Windows
• Pure Data the graphical audio-processing language

Video games

• Perfect Dark (series), a series of video games that includes the following titles:

• Perfect Dark, the debut video game in the series
• Perfect Dark (Game Boy Color), the second video game in the series
• Perfect Dark (Xbox Live Arcade), the remake of the original game

• Pokémon Diamond and Pearl, fourth installments of Pokémon game
• Polyphony Digital, developer of the Gran Turismo series.
• Princess Daisy, a Nintendo character

Places

• Province of Padua, Italy (ISO 3166-2:IT)

Economics and business

• Personal development, as used in the self-help and personal growth industry
• Probability of default, used in finance (Basel II)
• Professional degree, or First professional degree
• Professional development
• Program director

Law, government, and society

• Police department
• Preventive detention
• Property damage liability, in insurance
• Public defender
• Public domain

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".

See also

• Pee Dee