PPD
# PPD

PPD may refer to:

## Computing

* Prearranged Payment and Deposit; a payment format used in US inter-bank debit and credit transactions, part of the ACH Network specifications.
* Pixels per degree, a measure of the resolution of a display screen as seen from an angle
* Points per day, a mechanism for measuring work done in the Folding@home distributed computing project
* PostScript Printer Description, a file created by a printer vendor that describes the entire set of capabilities of a particular PostScript printer model
* Portable Programmer Device, Device used to program programmable ic

## Police and security

* Personal protection detail, a security detail tasked with protecting one or more persons
* Philadelphia Police Department, a police agency in Pennsylvania, United States
* Phoenix Police Department, a police agency in Arizona, United States
* Presidential Protective Division, part of the United States Secret Service tasked with protecting the President and others
* Probation and Parole Division in New Mexico, United States

## Political parties

* Social Democratic Party (Portugal) (Partido Social Democrata), originally named Popular Democratic Party or Democratic People's Party (Partido Popular Democrático), a political party in Portugal
* Partito Popolare Democratico Svizzero, a political party in Switzerland
* Party for Democracy (Chile) (Partido por la Democracia), a political party in Chile
* Popular Democratic Party (Puerto Rico) (Partido Popular Democrático), a political party in Puerto Rico

## Science and medicine

* Paranoid personality disorder, a mental disorder characterized by paranoia and a pervasive, long-standing suspiciousness and generalized mistrust of others.
* p-Phenylenediamine, an aromatic amine
* Persistent Pigment Darkening, a measure of UVA protection of sunscreens
* Pharmaceutical Product Development, a global contract research organization (CRO)
* Pheophorbidase, an enzyme
* PPD test, Purified Protein Derivative test or Mantoux test, a screening test for tuberculosis
* Postpartum depression, a mental disorder affecting parents within the first year of their child's birth
* Pour point depressant, a chemical added to crude oil to lower its "pour point"
* ppd, Protopanaxadiol, a molecule
* Psychogenic polydipsia, excessive water intake with a psychiatric or pharmaceutical cause
* Postharvest physiological deterioration, natural change of crop tissues which is undesirable for human or livestock use

## Other

* PPD, Inc., an American contract clinical trial company.
* Pani Poni Dash!, a Japanese manga series
* Partners in Population and Development, an international intergovernmental organization for "southern" countries worldwide
* Pengangkutan Penumpang Djakarta, a bus operator in Jakarta, Indonesia
* Pontypridd railway station, Wales, its National Rail station code
* ppd, an American professional video game player
* PPD-40, a Russian submachine gun
* Prevention Project Dunkelfeld, an effort to help self-identifying pedophiles to stay offence free
* Published Price to Dealer, a music industry term designating unit price
* Presidential Policy Directive, a kind of national security directive from the Obama presidency
