QR

QR may stand for:

Arts and entertainment

Queensrÿche, a progressive metal band
Nippon Cultural Broadcasting, a Tokyo radio station, from call sign JOQR
Queen's Radio, a student radio station at Queen's University Belfast

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

Military

Queen's Rangers, a military unit who fought in the American War of Independence
Queen's Regulations, a guidance on conduct in the UK's armed forces

Places

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

Science, technology, and mathematics

Mathematics

QR decomposition, a decomposition of a matrix
QR algorithm, an eigenvalue algorithm using QR decomposition
Quadratic reciprocity, a theorem from modular arithmetic
Quasireversibility, a property of some queues
Reaction quotient (Q_r), a function of the activities or concentrations of the chemical species involved in a chemical reaction

Other uses in 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
Quick release skewer, a device used to secure the wheels on a bicycle

Other uses

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

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