SI is the International System of Units.
SI, Si, or si may also refer to:
Arts, entertainment, and media
Literature
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Si (novel), a 2014 novel by Bob Ong
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Sí (Peruvian magazine), a magazine notable for its anti-corruption reporting
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Skeptical Inquirer, an American magazine covering topics on science and skepticism
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Sports Illustrated, an American sports magazine
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Soccer International, an Australian monthly magazine
Music
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Sí (Julieta Venegas album), released in 2003
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Sì (Andrea Bocelli album), released in 2018
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"Sí" (Martin Jensen song), a 2015 song
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Si (musical note), the seventh note in the traditional fixed do solfège
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Sì (operetta), an operetta by the Italian composer Pietro Mascagni
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"Sì" (Gigliola Cinquetti song), the Italian entry to the Eurovision Song Contest 1974
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Si (Zaz song), 2013
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Sí, a 2013 Spanish album by Malú
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"Sì", a 1985 song released by Italian actress Carmen Russo
Other uses in arts, entertainment, and media
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Si (film), original title of the 2010 South Korean film Poetry
Enterprises and organisations
Computing
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Swiss Informatics Society, a Swiss organization of computer science educators, researchers, and professionals
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The SI, a former name of the American defense contractor Vencore
Education
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St. Ignatius College Preparatory, a Jesuit high school in San Francisco, California, US
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Silay Institute, a private college in the Philippines
Government
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Si, a South Korean administrative unit
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Survey of India, an Indian government agency responsible for managing geographical information
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Swedish Institute ( Svenska institutet), a Swedish government agency which promotes Sweden abroad
Politics
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Sarekat Islam, a socio-political organization in Indonesia under Dutch colonial rule
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Catalan Solidarity for Independence, a Catalan political party
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Situationist International, an organization of social revolutionaries
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Socialist International, a worldwide organization of political parties
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Solidarity and Equality, an Argentine political party (Spanish: Solidaridad e Igualdad)
Transportation
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Blue Islands (IATA airline code, SI)
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Skynet Airlines (IATA airline code SI, ceased operating 2004)
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Spokane International Railroad (reporting mark SI), a former railway in Washington, US
Other enterprises and organizations
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Samahang Ilokano, a fraternity/sorority based in the Philippines
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SÍ Sørvágur, a Faroese sports association
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Society of Indexers, a professional society based in the UK
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Sports Interactive, a British computer games development company
People with the name
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Si (surname), a Chinese surname
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Si (given name)
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Princess Si of Anding,first daughter of Wu zetain
Places
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Mount Si, a mountain in the U.S. state of Washington
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Si (ancient Seeia/Seia), northern Hauran (ancient Auranitis), Syria; archaeological site with Nabataean temples, necropolis
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Province of Siena (postal code and vehicle registration plate code)
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Si County, Anhui, China
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Si River, in China
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Slovenia's ISO 3166-2 code
Science and technology
Biology and healthcare
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Smithsonian Institution (SI is its international code)
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Sacroiliac, an anatomical abbreviation for the sacroiliac (joint)
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Self-injury, intentional, direct injuring
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Suicidal ideation, thoughts of suicide
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Shock index, a measurement used to determine if a person is suffering shock
Chemistry
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si, a chemical descriptor; See prochirality
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Silicon, symbol Si, a chemical element
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Disulfur diiodide, empirical formula SI
Computing and Internet
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.si, the Internet country code top-level domain for Slovenia
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Shift In, an ASCII control character
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SI register, or source index, in X86 computer architecture
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Swarm intelligence, an artificial intelligence technique
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Synthetic intelligence, an alternate term for or a form of artificial intelligence
Motor vehicles
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Honda Civic Si, an automobile
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Spark-ignition engine, a type of internal combustion engine
Other uses in science and technology
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Signal integrity, electronic circuit tools and techniques that ensure electrical signals are of sufficient quality
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Sine integral, Si(x)
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Spectral interferometry, attosecond physics technique
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Systems integrator, in engineering
Titles and ranks
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Si, a Maghrebi Arabic variant of Sidi, a title of respect
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Si, a variant of the Thai honorific Sri
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Station inspector, a rank in the Singapore Police Force
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Sub-inspector, a rank in Indian Police forces
Other uses
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Statutory instrument (UK), abbreviated SI, the principal form in which delegated legislation is made in Great Britain
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Sì (dessert), a Chinese dessert
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Sídhe, Sí, or Sìth, Celtic mythological beings
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si, the Sinhala language ISO 639 alpha-2 code
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Supplemental instruction, an academic support program often used in higher education
See also
