# PD

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

## Arts and media

* People's Democracy (newspaper), weekly organ of the Communist Party of India (Marxist)
* The Plain Dealer, a Cleveland, Ohio, US newspaper
* Post Diaspora, a time frame in the Honorverse series of science fiction novels
* Principia Discordia, a 1965 holy text in Discordianism
* Production designer, a profession in film or television
* Production diary, a promotional video podcast
* Public domain, a copyright status

## Economics and business

* Personnel department, of an organization
* Price discrimination, a microeconomic pricing strategy
* Probability of default, used in finance (Basel II)
* Professional degree, or first professional degree
* Professional development, learning to earn or maintain professional credentials
* Program director, in service industries
* Public Debt, of a government

## Organizations
### Companies

* Phelps Dodge, a former American mining company, now part of Freeport-McMoRan
* Polyphony Digital, developer of the Gran Turismo video game series
* Porter Airlines (IATA airline designator), a regional airline headquartered at Billy Bishop Toronto City Airport, Canada

### Government and law

* Police department
* Preventive detention, an imprisonment that is putatively justified for non-punitive purposes
* Property damage liability, in insurance
* Public defender, an attorney appointed to represent people who cannot afford to hire one
* Public domain, works whose exclusive intellectual property rights are no longer valid
* Punitive damages

### Political parties

* Democratic Party of Albania (Partia Demokratike), a centre-right political party in Albania
* Democratic Party (Indonesia) (Partai Demokrat), a political party in Indonesia
* Democratic Party (Italy) (Partito Democratico), a centre-left political party in Italy
* Democratic Party (Malta) (Partit Demokratiku), a centre-left political party in Malta
* Democratic Party (Romania) (Partidul Democrat), a social-democratic and, later, a centre-right political party in Romania
* Democratic Party – demokraci.pl (Partia Demokratyczna – demokraci.pl), Poland
* Party of Democrats (Partito dei Democratici), a defunct political party in San Marino
* People's Democracy (Ireland), a defunct political organization in Ireland
* Progressive Democrats, a defunct political party in the Republic of Ireland
* Proyecto Dignidad, a political party in Puerto Rico

## Places

* Province of Padua (ISO 3166-2:IT), Italy
* Port Dickson (town), a coastal city in Negeri Sembilan, Malaysia

## Professions

* Doctor of Pharmacy, also abbreviated PharmD
* Postdoctoral, a research position or course of study
* Privatdozent, a title or position especially in German universities
* Production designer, a profession in film or television

## Science and technology
### Medicine

* Paleolithic diet, a diet based on presumed ancient diets
* Panic disorder, a condition with excessive fear or anxiety
* Parkinson's disease, a degenerative neurological condition
* Paroxysmal dyskinesia, a group of movement disorders
* Pediatric dentistry, mouth health care and tooth repair for children
* Peritoneal dialysis, a way to filter the blood when the kidneys are not working well
* Personality disorder, any of various psychiatric problems
* Peyronie's disease, a connective tissue disorder involving the growth of fibrous plaques in the soft tissue of the penis
* Pharmacodynamics, the study of how a drug affects an organism
* Phenyldichloroarsine, a blister agent and vomiting agent
* Polydipsia, excessive thirst
* Progressive disease, a disease that continues to worsen and often has no proven total cure
* Psychotic depression, a major depressive episode that is accompanied by psychotic symptoms
* Pupillary distance, in optometry

### Computing

* pandas (software), function package for statistical analysis in the Python programming language
* Pentium D, a dual-core variant of the Pentium 4 processor
* Perfect Dark (P2P), a Japanese peer-to-peer file-sharing (P2P) application designed for use with Microsoft Windows
* Phase-change Dual, an optical media format
* Pure Data, a graphical audio-processing language
* USB PD (USB Power Delivery), an extension of the USB standard

### Physics

* Photodiode, a semiconductor device that converts light into current
* Potential difference, or voltage
* Partial discharge, an undesirable discharge phenomenon in high voltage dielectrics

### Other uses in science and technology

* 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
* Photodisinfection, an alternative name for Antimicrobial Photodynamic Therapy
* Point-defence, a category of weapons
* Axiom of projective determinacy, in mathematical logic
* Pumpe Düse, a Volkswagen Group name for Unit Injector diesel engine technology

## Other uses

* The NYSE ticker symbol of PagerDuty
* Padang railway station, West Sumatra, Indonesia (station code)
* Full stop (or period, in American English), used in coded military communications
* Personal development, as used in the self-help and personal growth requiring fields
* peu difficile, in mountaineering, "little difficult" climbing grade International French adjectival system