SR

SR as an acronym may refer to:

Geography and politics

• Slovak Republic, official political name of Slovakia
• Socialist Republic or socialist state, as in USSR, ASSR, RSFSR, etc
• Socialist-Revolutionary, as in the Russian Socialist-Revolutionary Party, operative 1902-1940
• A Just Russia (Spravedlivaya Rossiya), a Russian political party, formed in 2006

Non-political organizations

• Sørvágs Róðrarfelag, a Faroese rowing association
• Saarländischer Rundfunk, a German regional public broadcasting company
• Sveriges Radio, a Swedish national publicly funded radio broadcasting company

Science

• Steradian, the SI unit of solid angle
• Sedimentation rate, shortened form for Erythrocyte sedimentation rate
• Sarcoplasmic reticulum, a structure found within muscle cells
• Sinus rhythm, the pattern made by a healthy heart on an electrocardiogram
• Sodium ricinoleate, compound used in SR toothpaste
• Special relativity, a theory of space and time created by physicist Albert Einstein
• Single-reduction, a type of steam turbine
• Strontium, a chemical element of the alkaline earth metals group
• Sustained release or slow release formulation of a medicine, e.g. Wellbutrin SR
• Synchrotron radiation, electromagnetic radiation from charged particles moving in magnetic fields
• Systematic review or standardized review
• Stimulus-response, a term used in psychology or criminology
• SR protein, a type of proteins which are involved in regulating and selecting splice sites in eukaryotic mRNA

Technology

• Selective repeat, a type of Automatic Repeat-reQuest Protocol
• Shift register, a group of processor registers set up in a linear fashion
• Slew rate, the maximum rate of change of electrical signals
• Sound reinforcement, a high-power audio system
• Speech recognition, the process of converting speech to text
• SR flip-flop circuit, an electronic logic device
• SR programming language, a concurrent computer programming language
• Steam reforming, the catalytic reaction of hydrocarbon with steam
• Symbol rate, a term used in data transmission
• Student Robotics, a competition for 16- to 18-year-olds to build robots

Transportation

• Southern Railway Zone, a zone in Indian Railways
• Southern Railway (United Kingdom)
• Southern Railway (U.S.)
• State route, a designation for highways in some American states
• the IATA code for the Swissair airline
• Nissan SR engine
• an abbreviation for Sun Roof usually in motor sales advertising
• Saunders-Roe, a former British aircraft manufacturer
• Manx SR and SR2, 1970 American kit cars based on the Volkswagen Beetle frame

Music

• Suburban Rhythm, a ska/punk band
• Straylight Run, an American alternative/indie band
• Simply Red, a pop/rock band
• Steve Rothery, a guitarist of Marillion
• Sigur Rós, an Icelandic post-rock band

Gaming

• Saints Row (series), a video game series
  • Saints Row (video game), the first title in the series
• Shadowrun, a cyberpunk fantasy roleplaying game
• Several video games featuring Sonic the Hedgehog, including:
  • Sonic R
  • Sonic Riders
  • Sonic Rush
• Soul Reaver, the sequel to Blood Omen in the Legacy of Kain series
• Space Rangers (video game), a turn-based space trading and combat simulator

Film, television and literature

• School Rumble, an anime and manga series
• Speed Racer, a manga and anime series from the 60s
  • Speed Racer (film), a live-action adaptation of the anime series
• Superman Returns, a 2006 film based on the iconic superhero
• Skarloey Railway, a fictional railway in both The Railway Series and Thomas the Tank Engine and Friends by W.V. Awdry

Other

• Sands Regency, a hotel and casino located in Reno, Nevada
• Saudi riyal, the currency of Saudi Arabia
• Siena Reno, a hotel and former casino located in Reno, Nevada
• Steel Reserve, an alcoholic beverage
• Scoville rating, a measure of the "hotness" of a chili pepper
• Spelling reform, demonstrably different from simplified spelling
• Strategic Reconnaissance, a code used for the Blackbird (plane)
• Slot receiver, a position in American football
• Serbian language, ISO-639-1 code
• Sincere regards (s/r), a form of valediction