Biology and medicine • Partial Response, a component of
Response Evaluation Criteria in Solid Tumors •
Pathogenesis-related proteins, produced by plants under pathogen attack •
Penicillium roqueforti •
Per rectum, a
medical abbreviation meaning "administered rectally" •
PR interval, a measurement used in cardiology •
PR-104 •
Progesterone receptor, a protein
Computing •
PR (complexity), a complexity class •
pr (Unix), Unix command to paginate or columnate files for printing •
Adobe Premiere Pro, software which uses "Pr" as its icon abbreviation •
Pagerank, a Google technology •
Performance Rating, a computing term by AMD •
Project Reality, series of video games •
Pull request, part of distributed version control • Part of the
YPbPr standard
Mathematics •
PR (complexity), a complexity class • Pr(
E), also P(
E), the probability of an
event E • pr
i, a notation for the
scalar projection onto the
i-th component •
Positive-real function, in mathematics •
Proportional representation, a property of some voting systems
Other uses in science and technology •
Praseodymium, symbol Pr, a chemical element •
Prandtl number, in physics and engineering, typically denoted
Pr •
Propyl radicals or groups, denoted
Pr in organic chemistry ==Sports==