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Si


 
  Si, si, or SI may refer to (all SI unless otherwise stated):

In language:
  • ISO 639 alpha-2 code for the Sinhalese language


In computer science:
  • .si.si

    .si is the Internet country code top-level domain for Slovenia....
    , the Internet country code top-level domain for Slovenia
  • Shift In, a control code in the C0 control code set
  • Swarm IntelligenceSwarm intelligence

    Swarm intelligence is an artificial intelligence technique based around the study of collective behavior in decentralized, s...
    , an artificial intelligence technique
  • Synthetic IntelligenceSynthetic intelligence

    Synthetic intelligence is the term which is sometimes used interchangeably with artificial intelligence....
    , a form of artificial intelligence


In education:
  • Saint Ignatius College Prepatory, a Jesuit college in the United States
  • Samahang IlokanoSamahang Ilokano Overview

    Confederation of Ilocano Association Inc....
    , a fraternity/sorority based in the Philippines
  • Seletar InstituteSeletar Institute

    Seletar Institute was one of the four original centralised institutes in Singapore and one of the pre-university centres in Singap...
    , a defunct centralised institute in Singapore
  • Silay Institute, Inc., a private college in the Philippines
  • Smithsonian InstitutionSmithsonian Institution

    The Smithsonian Institution is an educational and research institute and associated museum complex, administered and funded...
    , an American educational and research institute


In gaming:
  • Si, a self-replicating artifact in the computer game Ancient Domains of MysteryAncient Domains of Mystery

    ADOM is a roguelike game in which the player's aim is to stop the forces of Chaos which are invading the world of Ancardia....
  • , an expansion pack for The Elder Scrolls IV: Oblivion
  • Sports InteractiveSports Interactive

    Sports Interactive is a computer games development company currently based in Islington, North London and owned by internati...
    , a British computer games development company


In mathematics and science:
  • Signal integritySignal integrity

    Signal Integrity, sometimes known as SI, refers to electronic circuit tools and techniques that ensure electrical sign...
    , electronic circuit tools and techniques that ensure electrical signals are of sufficient quality for proper operation
  • Si, the chemical symbol for siliconSilicon

    Silicon is the chemical element in the periodic table that has the symbol Si and atomic number 14....
  • Si(x), the sinc functionSinc function

    The sinc function, denoted by , has two definitions, sometimes distinguished as the normalized sinc function and unnor...
     in mathematics
  • Si, the sine integral in mathematics
  • Survey of IndiaSurvey of India

    The Survey of India is India's central agency in charge of mapping and surveying....
    , an Indian government agency responsible for managing geographical information about India
  • International System of UnitsInternational System of Units

    The International System of Units is the modern form of the metric system....
     (Système International d'Unités), the modern international standard version of the metric system
  • Simple Interest  (Mathematics)

In medicine:
  • Sacroiliac
  • Self-injury
  • Sensory integrationSensory integration

    Sensory integration is defined as the neurological process that organizes sensation from one's own body and the environment,...
    , the neurological process that organizes sensation from one's own body and the environment
    • Upper often referring to Primary somatosensory cortex
  • Sexual intercourseSexual intercourse

    Sexual intercourse, also called coitus, is the human form of copulation....
    , a medical abbreviation
  • Suicidal ideationSuicidal ideation

    Suicidal ideation is a common medical term for the mere thoughts about and of plans of committing suicide, not the actual fo...
    , a medical term for thoughts about suicide
  • Sacroiliac, an anatomical abbreviation for the sacroiliac (joint)


In music:
  • Si, the original name of the seventh note of solfegeSolfege

    In music and sight singing solfege or solmization is a way of assigning syllables to degrees or steps of the diatonic ...
    , later changed to "Ti"
  • Sì (song)Sì (song)

    "S?" is the name of the Italian entry to the Eurovision Song Contest 1974, which finished second behind the Swedish entry W...
    , the name of the Italian entry to the Eurovision Song Contest 1974
  • (Julieta Venegas)Sí (Julieta Venegas)

    "S?" is the third album by the Mexican singer-songwriter Julieta Venegas....
    , an album by Mexican singer and songwriter Julieta Venegas


  • Si, another name for the SídheSídhe

    Sdhe is an Irish and Scottish Gaelic word referring first to earthen mounds that were thought to be home to a supernatural ...
    , Celtic mythological beings


In government and politics:
  • Situationist International, a left-wing organisation
  • Socialist InternationalSocialist International Overview

    The Socialist International is a worldwide organization of social democratic, labor, and democratic socialist political part...
    , a worldwide organisation of social democratic, labour, and democratic socialist political parties
  • Sub-InspectorFacts About Sub-Inspector

    Sub-Inspector is a rank used extensively in the Indian Police, which is primarily based on the British model....
    , a rank in Indian Police forces
  • Station InspectorStation Inspector

    Station Inspector is the third highest non-commissioned officer rank in the Singapore Police Force, below that of Senior Sta...
    , the highest non-commissioned rank in the Singapore Police Force
  • Statutory InstrumentStatutory Instrument

    Statutory Instruments are parts of United Kingdom law separate from Acts of Parliament which do not require full Parliamenta...
    , a form of delegated or secondary legislation in Great Britain
  • Swedish InstituteSwedish Institute

    The Swedish Instituteis a Swedish government agency with the responsibility to spread information about Sweden abroad, to pr...
     (Svenska institutet), a Swedish government agency which promotes Sweden abroad
  • Sí or Solidarity and EqualitySolidarity and Equality Overview

    Solidarity and Equality is a centre-left Argentine political party, founded in 2008 as a splinter from ARI....
    , an Argentine political party


In sports:
  • SÍ Sørvágur, a Faroese sports association
  • Sports IllustratedSports Illustrated

    Sports Illustrated is an iconic weekly American sports magazine owned by media giant Time Warner....
    , an American sports magazine


In transportation:
  • IATA code for Skynet AirlinesSkynet Airlines

    Skynet Airlines began operations from Shannon International Airport, Ireland, to Amsterdam, Netherlands, with onward connect...
  • Reporting mark of Spokane International RailroadSpokane International Railroad

    The Spokane International Railroad was a short line railroad which first went into operation December 31 1887 between Spoka...
    , a former railway in Washington, USA


Other:
  • Civic Si
  • Sergeant Instructor, an appointment in the British Army
  • Scouting IrelandScouting Ireland

    Scouting Ireland is the national Scouting association of Ireland and a member of the World Organization of the Scout Movemen...
    , the national Scouting association of Ireland
  • Staten IslandStaten Island

    Staten Island is one of the five boroughs of New York City....
    , a borough of New York City and an island in the Hudson River
  • System integratorSystem integrator

    A system integrator is a person or company that specializes in integrating systems....
    , a person or company that specialises in integrating systems
  • Solomon IslandsSolomon Islands

    The Solomon Islands is a nation in Melanesia, east of Papua New Guinea, consisting of nearly one thousand islands....
    , a Pacific island nation
  • Si River, a river in China
  • Secret InvasionSecret Invasion

    Secret Invasion is a comic book limited series and crossover that began in April 2008, published by Marvel Comics....
    , a 2008 Marvel Comics event
  • SuperintendentSuperintendent (police)

    Superintendent, often shortened to "Super", is a rank in British police services and in most English-speaking Commonwealth n...
    , senior rank of British Police

See also

  • S1S1

    ;S1*S1, a line on the Berlin S-Bahn*S1 Invicta...