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Meanings and definitions for SI

What does SI stand for? What does SI mean?

The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system.
Si (novel), a 2014 novel by Bob Ong
Sí (Peruvian magazine), a magazine notable for its anti-corruption reporting
Skeptical Inquirer, an American magazine covering topics on science and skepticism
Sports Illustrated, an American sports magazine
Sí (album), a Spanish album by Mexican singer and songwriter Julieta Venegas
Sì (Andrea Bocelli album), released in 2018
"Sí" (Martin Jensen song), a 2015 song
Si (musical note), the seventh note in the traditional fixed do solfège
Sì (operetta), an operetta by the Italian composer Pietro Mascagni
"Sì" (song), the name of the Italian entry to the Eurovision Song Contest 1974
Sí, a 2013 Spanish album by Malú
"Sì", a 1985 song released by Italian actress Carmen Russo
Si (film), original title of the 2010 South Korean film Poetry
Swiss Informatics Society, a Swiss organization of computer science educators, researchers, and professionals
The SI, a former name of the American defense contractor Vencore
St. Ignatius College Preparatory, a Jesuit high school in San Francisco, California, US
Silay Institute, a private college in the Philippines
Si, a South Korean administrative unit
Smithsonian Institution, a U.S. government educational and research institute (website si.edu)
Survey of India, an Indian government agency responsible for managing geographical information about India
Swedish Institute (Svenska institutet), a Swedish government agency which promotes Sweden abroad
Catalan Solidarity for Independence, a pro-independence Catalan political party
Situationist International, a left-wing organisation
Socialist International, a worldwide organization of democratic socialist and labour political parties
Solidarity and Equality, an Argentine political party (Spanish: Solidaridad e Igualdad)
Blue Islands (IATA airline code, SI)
Skynet Airlines (IATA airline code SI, ceased operating 2004)
Spokane International Railroad (reporting mark SI), a former railway in Washington, US
Samahang Ilokano, a fraternity/sorority based in the Philippines
SÍ Sørvágur, a Faroese sports association
Sports Interactive, a British computer games development company
Si (surname), a Chinese surname
Si Robertson (born 1948), cast member of Duck Dynasty and its spinoff Going Si-ral
Simon (given name), abbreviated Si
Mount Si, a mountain in the U.S. state of Washington
Province of Siena (two letter provincial designator), an Italian province
Si County, county in Anhui, China
Si River, a river in China
Slovenia (ISO 3166-2), a country
Sacroiliac, an anatomical abbreviation for the sacroiliac (joint)
Self-injury, intentional, direct injuring
Shock index, a measurement used to determine if a person is suffering shock
si, a chemical descriptor; See Prochirality
Silicon (Si), a chemical element
.si, the Internet country code top-level domain for Slovenia
Shift In, a control code in the C0 control code set
SI register, or source index, in X86 computer architecture
Swarm intelligence, an artificial intelligence technique
Synthetic intelligence, an alternate term for or form of artificial intelligence
Honda Civic Si, an automobile
Spark-ignition engine, a type of internal combustion engine
International System of Units (Système international d'unités, abbreviated SI), the modern international standard version of the metric system
Signal integrity, electronic circuit tools and techniques that ensure electrical signals are of sufficient quality
Sine integral, Si(x)
Si, a Maghrebi Arabic variant of Sidi, a title of respect
Si, a variant of the Thai honorific Sri
Station inspector, a rank in the Singapore Police Force
Sub-inspector, a rank in Indian Police forces
Sì (dessert), a Chinese desert
Sídhe or Si, Celtic mythological beings
Sinhala language (ISO 639 alpha-2 code: si)
Statutory Instrument, a form of delegated or secondary legislation
Supplemental instruction, an academic support program often used in higher education
S1 nuclease, an enzyme that digests singled-stranded DNA and RNA
S1: Keep locked up, a safety phrase in chemistry
Primary somatosensory cortex, also known as S1
Tegafur/gimeracil/oteracil, also known as S-1, a chemotherapy medication
S1 (Indian television station), a Hindi language television channel
S1 (producer), a hip hop producer, member of the group Strange Fruit Project
S1 No. 1 Style, a Japanese adult video company
S-1 (Muay Thai), the championship of Thai boxing (Muay Thai)
Gibson S-1, a guitar made by the Gibson Guitar Corporation
Bill S-1, a pro forma bill in Canadian Parliament
Form S-1, a U.S. Securities and Exchange Commission filling
S-1 Executive Committee, a United States government entity during World War II
S1 (military), an administrative position within military units
ACPI S1 power state in computing
Apple S1, integrated computer used in the Apple Watch
Canon PowerShot S1 IS, a 2004 3.2 megapixel digital camera
FinePix S1 Pro, a 2000 interchangeable lens digital single-lens reflex camera by Fujifilm
Nikon Coolpix S1, a digital camera
S1 Corporation, an American software development company
S1 Core, a microprocessor-core
S1 MP3 Player
Samsung Galaxy S also commonly called S1 is a smartphone from 2010
Sendo S1, a Sendo mobile phone model
Siemens S1, a Siemens mobile phone
Sony BDP-S1, a first generation Blu-ray Disc (BD) Player
S1, an EPC in an LTE/4G network
County Route S1 (California)
FGC line S1, a suburban train line in Barcelona Province
Line S1 (Milan suburban railway service)
Line S1 (Nanjing Metro)
Line S1 (Wenzhou Metro)
S1 (Berlin), an S-Bahn line
S1 (Dresden), an S-Bahn line
S1 (Long Island bus)
S1 (Munich), an S-Bahn line
S1 (Rhine-Main S-Bahn), an S-Bahn line
S1 (Rhine-Ruhr S-Bahn), an S-Bahn line
S1 (Vienna), an S-Bahn line
S1 line (Beijing Subway)
S1 National Highway, a National Highways of Pakistan
S1 Yingbin Expressway in Shanghai
Stagecoach Gold bus route S1, in Oxfordshire, England
Blackburn Buccaneer S.1 jet naval strike aircraft
Focke-Wulf S 1, a German Focke-Wulf aircraft
Fokker S.I, a 1919 Dutch primary trainer aircraft
Hopfner S-1, a Hopfner aircraft
Letov S-1, a 1920 Czechoslovak surveillance aircraft
Loening S-1, a United States Army Air Service seaplane
Loughead S-1 Sport 1920 US biplane
Martinsyde S.1, a 1914 British biplane aircraft
Pantsir-S1, a Russian anti-aircraft system
Pitts S-1 aerobatic biplane
S-1 Loening, a United States Army Air Service seaplane
SSBS S1, a French experimental rocket
Swift S-1, a 1991 Polish single seat aerobatic glider
Audi S1, performance variant of Audi A1
Invicta S1, a 2004 sports car
S1 Scout Car, an armoured car built in Australia during the Second World War
Superformance S1 Roadster, a Lotus Seven Type replicar produced in South Africa between 2001 and 2004, 56 vehicles were produced
Alco S-1, a locomotive
PRR S1, a duplex locomotive developed by the Pennsylvania Railroad
USS S-1 (SS-105), a 1918 United States Navy experimental submarine
a postcode covering Sheffield City Centre
in human anatomy it can refer to either:
the first sacral vertebra
the sacral spinal nerve 1 of the vertebral column
the primary somatosensory cortex in the brain
Senior 1, the First Year in the Scottish secondary education system
season one (of a television series)
the Comet Ikeya-Seki, C/1965 S1
the Upplands regemente (signal), a 1902 Signal Regiment of the Swedish Armed Forces
a planned Bremen S-Bahn line
a Hamburg S-Bahn line
a Hanover S-Bahn line
a Nuremberg S-Bahn line
a RheinNeckar S-Bahn line
a Rhein-Ruhr S-Bahn line
a Rhine-Main S-Bahn line
a Rostock S-Bahn line
a Stuttgart S-Bahn line
a Stadtbahn Karlsruhe line
a star catalogue
S1 (heart sound), a heart sound in cardiac auscultation
S1, the n-sphere in two dimensions i.e. a circle
S1, the one-dimensional sphere, or a circle
Inverse second (s−1), a unit of frequency
Akai S01, an Akai synthesizer
ATC code S01 Ophthalmologicals, a subgroup of the Anatomical Therapeutic Chemical Classification System
HMS Porpoise (S01), a 1956 Porpoise-class submarine of the Royal Navy
MULTI-S01, an encryption algorithm based on a pseudorandom number generator
Salt Institute
Self Injury
Silicon, Chemical element
Slovenia, (705) ISO 2-letter country code
Source Index
Staten Island
Status Indicator
Supplementary Information, additional material to articles of Nature, published online by the NPG
Systeme Internationale
System Information
System Integrater
Sports Illustrated , Magazine