Arts and media

• Si (film), original title of the 2010 South Korean film Poetry

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

Music

• 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" (Martin Jensen song), a 2015 song

• "Sì", a 1985 song released by Italian actress Carmen Russo

• Sí (album), a Spanish album by Mexican singer and songwriter Julieta Venegas

• Sí, a 2013 Spanish album by Malú

• Sì (Andrea Bocelli album), released in 2018

Publications

• Si (novel), a 2014 novel by Bob Ong

• Sí (Peruvian magazine), a magazine notable for its anti-corruption reporting

• The Scots Independent, a Scottish nationalist newspaper

• Skeptical Inquirer, an American magazine covering topics on science and skepticism

• Sports Illustrated, an American sports magazine

Organisations

• SÍ Sørvágur, a Faroese sports association

• Samahang Ilokano, a fraternity/sorority based in the Philippines

• Scouting Ireland, the national Scouting association of Ireland

• Societas Iesu, the Jesuits, a religious order of the Roman Catholic Church

• Sports Interactive, a British computer games development company

• Skynet Airlines (IATA airline code SI)

• Spokane International Railroad (reporting mark SI), a former railway in Washington, US

Education

• St. Ignatius College Preparatory, a Jesuit high school in San Francisco, California, US

• Seletar Institute, a defunct centralised institute in Singapore

• Silay Institute, a private college in the Philippines

• Smithsonian Institution, an American educational and research institute

Government

• Smithsonian Institution, a U.S. government educational and research institute

• 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

• Si, a South Korean administrative unit

Computing

• The SI, a former name of the American defense contractor Vencore

• Swiss Informatics Society, a Swiss organization of computer science educators, researchers, and professionals

• Silicon Image, a computer chip vendor

Politics

• Sarekat Islam, an early-twentieth-century Indonesian political organization

• 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

• Survival International, a non-governmental indigenous rights organization

Places

• Mount Si, a mountain in the U.S. state of Washington

• Si County, county in Anhui, China

• Si River, a river in China

• Province of Siena (two letter provincial designator), an Italian province

• Slovenia (ISO 3166-2), a country

• Solomon Islands, a Pacific island nation

• Southern Ireland (1921–22), a former name for the Republic of Ireland

• Staten Island, a borough of New York City and an island in the Hudson River

Science and technology

• International System of Units (Système international d'unités), the modern international standard version of the metric system

• Silicon (Si), a chemical element

• Signal integrity, electronic circuit tools and techniques that ensure electrical signals are of sufficient quality

• Sine integral Si(x)

• si, a chemical descriptor; See Prochirality

• Superimposition, in sound recording

Biology and medicine

• Sacroiliac, an anatomical abbreviation for the sacroiliac (joint)

• Self-injury, intentional, direct injuring

• Sexual intercourse, a medical abbreviation

• Small intestine, part of the gastrointestinal tract

• Substantia innominata, part of the basal forebrain

• Suicidal ideation, a medical term for thoughts about suicide

• Shock index, a measurement used to determine if a person is suffering shock

Computing and Internet

• .si, the Internet country code top-level domain for Slovenia

• SI register, or source index, in X86 computer architecture

• Shift In, a control code in the C0 control code set

• Swarm intelligence, an artificial intelligence technique

• Synthetic intelligence, an alternate term for or form of artificial intelligence

• Systems integrator, a type of company that specializes in integrating complex computer or data systems from multiple vendors

Vehicles

• Spark-ignition engine, a type of internal combustion engine

• Honda Civic Si, an automobile

Titles and ranks

• Si, a variant of the Thai honorific Sri

• Si, a Maghrebi Arabic variant of Sidi, a title of respect

• Sergeant instructor, an appointment in the British Army

• Sitara-i-Imtiaz, an honorary award for civilians and the military in Pakistan

• Station inspector, a rank in the Singapore Police Force

• Sub-inspector, a rank in Indian Police forces

• Superintendent (police), senior rank of British Police

Other uses

• Sì (dessert), traditional spherical dessert made by glutinous rice

• Si (surname), a Chinese surname

• Si Robertson (born 1948), cast member of Duck Dynasty and its spinoff Going Si-ral

• Sídhe or Si, Celtic mythological beings

• Simon (given name) (abbreviation)

• Simple interest, in finance

• Sinhalese language (ISO 639 alpha-2 code: si)

• Statutory Instrument, a form of delegated or secondary legislation in Great Britain

• Stroke Index, used in golf handicapping in the UK

• Structural Integration, a form of alternative medicine

• Supplemental instruction, an academic support program often used in higher education

See also

• S1 (disambiguation)