PR, P.R., Pr, pr, or Pr. may refer to:

Arts, entertainment, and media

* ''P.R.'' (TV series), a Canadian television sitcom * '' Partisan Review'', a former political and literary journal * '' Perry Rhodan'', German science fiction series * '' Power Rangers'', an American television franchise based on ''Super Sentai''

Places

PR postcode area The PR postcode area, also known as the Preston postcode area, is a group of eleven postcode districts in North West England, within four post towns. These cover south-west Lancashire (including Preston, Chorley and Leyland) and north Merseysid ...

, UK, including Preston and Lancashire * Paraná (state), Brazil (ISO 3166-2:BR) * Parma, Italy (ISO 3166-2:IT) * Puerto Rico, ISO 3166 code PR

Politics

* Pakatan Rakyat, an informal Malaysian political coalition * Party of Labour (''Partija rada''), a political party in Serbia * Proportional representation, a property of some voting systems *

Republican Party of Albania The Republican Party of Albania (, PR or PRSH ) is a national-conservative political party in Albania. It currently holds 3 of the 140 seats in the Parliament of Albania, in alliance with the Democratic Party of Albania. History The party was fou ...

, a political party in Albania

Public relations

* Public relations, the professional maintenance of a favorable public image by an organisation or person * Press release, a prepared statement given to the news media as a public-relations tool

Religion

* Pastor, an ordained leader of a Christian congregation * Permanens Rector, or Permanent Rector, of a parish

Science, technology, and mathematics

Biology and medicine

* Partial Response, a component of Response Evaluation Criteria in Solid Tumors *

Pathogenesis-related Pathogenesis-related (PR) proteins are proteins produced in plants in the event of a pathogen attack. They are induced as part of systemic acquired resistance. Infections activate genes that produce PR proteins. Some of these proteins are antimicro ...

proteins, produced by plants under pathogen attack *

Penicillium roqueforti ''Penicillium roqueforti'' is a common saprotrophic fungus in the genus ''Penicillium''. Widespread in nature, it can be isolated from soil, decaying organic matter, and plants. The major industrial use of this fungus is the production of blue ...

* '' Per rectum'', meaning "administered rectally" *Pigment Red (e.g., Para red,

Pigment Red 190 Pigment Red 190 (C.I. 71140), also called Vat Red 29, is a synthetic organic compound that is used both as a pigment and as a vat dye. Although structurally a derivative of perylene, it is produced from acenaphthene.K. Hunger. W. Herbst "Pigments, ...

) * PR interval, a measurement used in cardiology *

PR-104 PR-104 is a drug from the class of hypoxia-activated prodrugs (HAPs), which is being researched as a potential anti-cancer therapeutic agent. It is a phosphate ester “pre-prodrug” that is rapidly converted to the HAP PR-104A in the body. PR-10 ...

Progesterone receptor The progesterone receptor (PR), also known as NR3C3 or nuclear receptor subfamily 3, group C, member 3, is a protein found inside cells. It is activated by the steroid hormone progesterone. In humans, PR is encoded by a single ''PGR'' gene resid ...

, a protein

Computing

PR (complexity) PR is the complexity class of all primitive recursive functions—or, equivalently, the set of all formal languages that can be decided in time bounded by such a function. This includes addition, multiplication, exponentiation, tetration, etc. The ...

, a complexity class * pr (Unix), Unix command to paginate or columnate files for printing *

Adobe Premiere Pro Adobe Premiere Pro is a timeline-based and non-linear video editing software application (NLE) developed by Adobe Inc. and published as part of the Adobe Creative Cloud licensing program. First launched in 2003, Adobe Premiere Pro is a succes ...

, software which uses "Pr" as its icon abbreviation * Pagerank, a Google technology *

Performance Rating The PR (Performance Rating, P-rating) system was a figure of merit developed by AMD, Cyrix, IBM Microelectronics and SGS-Thomson in the mid-1990s (Cyrix announced it in February 1996) as a method of comparing their x86 processors to those of ri ...

, a computing term by AMD * Project Reality, series of video games * Pull request, part of distributed version control * Part of the YPbPr standard

Mathematics

, a complexity class * Pr(''E''), also P(''E''), the probability of an

event Event may refer to: Gatherings of people * Ceremony, an event of ritual significance, performed on a special occasion * Convention (meeting), a gathering of individuals engaged in some common interest * Event management, the organization of eve ...

''E'' *

Positive-real function Positive-real functions, often abbreviated to PR function or PRF, are a kind of mathematical function that first arose in electrical network synthesis. They are complex functions, ''Z''(''s''), of a complex variable, ''s''. A rational function is ...

, in mathematics * Proportional representation, a property of some voting systems

Other uses in science and technology

* Praseodymium, symbol Pr, a chemical element *

Prandtl number The Prandtl number (Pr) or Prandtl group is a dimensionless number, named after the German physicist Ludwig Prandtl, defined as the ratio of momentum diffusivity to thermal diffusivity. The Prandtl number is given as: : \mathrm = \frac = \frac ...

, in physics and engineering, typically denoted ''Pr'' * Propyl radicals or groups, denoted ''Pr'' in organic chemistry

Sports

Personal record (sport) A personal record or personal best (abbreviated to PR or PB) is an individual's best performance in a given sporting discipline. It is most commonly found in athletic sports, such as track and field, other forms of running, swimming and weightliftin ...

, an individual's personal record in a particular event *

Pinch runner In baseball, a pinch runner is a player substituted for the specific purpose of replacing another player on base. The pinch runner may be faster or otherwise more skilled at base-running than the player for whom the pinch runner has been sub ...

, in baseball *

Protected ranking This page is a glossary of tennis terminology. A * Ace: Serve where the tennis ball lands inside the '' service box'' and is not touched by the receiver; thus, a shot that is both a serve and a winner is an ace. Aces are usually powerful and ge ...

, a method of ranking tennis players coming back from injury *

Punt returner A return specialist or kick returner is a player on the special teams unit of a gridiron football team who specializes in returning punts and kickoffs. There are few players who are exclusively return specialists; most also play another position ...

, a position in American football

Transportation

* Pakistan Railways (reporting mark PR) * Park and ride, a type of car park with public transport connections * Philippine Airlines (IATA airline designation PR) *'' Poste restante'', mail held for collection

Other uses

* Pakistan Rangers, a paramilitary force of Pakistan * Parachute rigger, a former U.S. Navy rank * Permanent residency * Princess Royal * Professor