QR may refer to:

Arts and entertainment

<!--* Queensrÿche, a progressive metal band (fails WP:DABACRO)-->

  • Nippon Cultural Broadcasting (from call sign JOQR), a Tokyo radio station
  • Queen's Radio, a student radio station at Queen's University, Belfast
  • Quiet Riot, an American rock band <!--(fails WP:DABACRO, albums are borderline WP:PTM)-->

Businesses

  • Qatar Airways (IATA code)
  • Queensland Rail, a company responsible for the railway system in Queensland, Australia
  • Quintana Roo (company), a triathlon-specific wetsuit and bicycle company

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<!--* ==Military==-->

<!--* Queen's Rangers, a military unit who fought in the American War of Independence (fails WP:DABACRO)-->

<!--* * Queen's Regulations, a guidance on conduct in the UK's armed forces (fails WP:DABACRO)-->

Places

  • Quintana Roo, a state of Mexico
  • Karakalpakstan (Qoraqalpog'iston Respublikasi), Uzbekistan (ISO 3166-2 subcode UZ-QR)

Science and technology

  • QR code (Quick Response code), a two-dimensional code
  • ATCvet code QR Respiratory system, a section of the Anatomical Therapeutic Chemical Classification System for veterinary medicinal products
  • DICOM Q/R, DICOM Query / Retrieve
  • Nissan QR engine
  • Quarter (unit)
  • qr., , of a yard, equal to 9 inches
  • qr. av., , of a hundredweight, equal to 2 stone or 28 pounds avoirdupois

Mathematics

  • QR decomposition, a decomposition of a matrix
  • QR algorithm, an eigenvalue algorithm to perform QR decomposition
  • Quadratic reciprocity, a theorem from modular arithmetic
  • Quasireversibility, a property of some queues
  • Reaction quotient (Q<sub>r</sub>), a function of the activities or concentrations of the chemical species involved in a chemical reaction

Other uses

  • Quarterly Review, a defunct literary and political periodical
  • Qatari riyal, the currency of Qatar

See also

  • QRS (disambiguation)