{{Wiktionary|SR|sr|Sr.}} '''SR''' or '''sr''' may refer to: {{TOC right}} ==Arts and entertainment== * ''Science Reporter'', a magazine <!--* Shire Reckoning, a fictional calendar in J. R. R. Tolkien's Middle-earth (fails WP:DABACRO)--> * ''"Sr."'', a 2022 film featuring Roberts Downey Jr. and Sr.
==Businesses and organizations== ===Politics=== * Socialist Revolutionary Party, Russia, 1902–1941 * A Just Russia (''Spravedlivaya Rossiya''), a political party formed in 2006
===Transport=== * Southern Railway (UK) * Southern Railway (U.S.) * Swissair (IATA airline code SR) * Southern Railway zone, India * SR Corporation, a South Korean rail operator
===Other businesses and organizations=== * Sørvágs Róðrarfelag, a Faroese rowing association * Saarländischer Rundfunk, a German broadcaster * Sveriges Radio, a Swedish broadcaster
==Honorifics== * Senior (Sr.), a generational title suffix to a man's name <!--* Señor, a Spanish honorific prefix, equivalent to Mr. in English (see MOS:DABFOREIGN)--> * Religious sister (Sr.), in Catholicism
==Places== * Slovak Republic ({{langx|sk|Slovenská republika|links=no}}), the official name of Slovakia * Suriname (ISO 3166-1 country code SR) * West Sulawesi (ISO 3166-2:ID province code SR), a province of Indonesia
==Science and technology== ===Biology and medicine=== * SR protein, involved in RNA splicing * Sarcoplasmic reticulum, a structure found within muscle cells * Sustained release, in medicine
===Chemistry and physics=== * Steradian (symbol: sr), the SI unit of solid angle * Strontium (symbol: Sr), a chemical element
===Computing and electronics=== * .sr, the Internet top-level domain for Suriname * SR flip-flop circuit, an electronic logic device * SR programming language * Segment routing, a form of computer networking * Slew rate, the maximum rate of change of electrical signals * Sound reinforcement, a system to make sounds louder * Student Robotics, a robot-building competition * Surround Right (SR), a speaker on a 5.1 surround sound setup
===Transport=== * Codename of the 1992 to 2002 Dodge Viper * Nissan SR engine * Manx SR and SR2, 1970 US kit cars * State Route * Rockaway Park Shuttle in New York City, sometimes signed in documents as S<sup>R</sup>
==Other uses== * Strike rate (s/r), a statistic in cricket * Saudi riyal (currency symbol: SR), the currency of Saudi Arabia * Serbian language (ISO-639-1 language code: sr) * Slot receiver, a position in American football * Special reconnaissance, a military tactic ** United States Air Force Special Reconnaissance * Sudurpaschim Royals, a professional Twenty20 cricket franchise representing Sudurpashchim Province, Nepal in the Nepal Premier League <!--* Semi-rimmed in firearms (fails WP:DABACRO)-->
==See also== * {{In title|Sr}} * SR-25, a rifle<!--see WP:PTM--> * Lockheed SR-71 Blackbird, an aircraft<!--see WP:PTM--> * Cirrus SR20 and Cirrus SR22, a monoplane<!--see WP:PTM--> * Socialist Republic, as in USSR, ASSR, RSFSR, etc.<!--see WP:PTM--> * Gibbs SR, a brand of toothpaste * Senior (disambiguation)
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