SI (disambiguation)
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SI, Si, or si may refer to:
Science
- Silicon, chemical symbol Si
- International System of Units, abbreviated SI from its French name, Système International d'unités
- Self-injury
- Suicidal ideation, a medical term for thoughts about suicide
- Small intestine, part of the digestive system
- .si, the Internet country code top-level domain for Slovenia
Places
- Slovenia, a European country (from the ISO 3166-2 two-letter abbreviation)
- Solomon Islands, a Pacific island country
- South India, a region in India
- The South Island, one of the two main islands of New Zealand
- Southern Ireland, an old name for the Republic of Ireland
- Staten Island, a borough of New York City and an island in the Hudson River
- Province of Siena, an Italian province (two letter provincial code)
Other uses
- Sí (album), an album by Julieta Venegas
- Smithsonian Institution, a research institute
- Socialist International, an organisation of socialist and labour political parties
- Societas Iesu, the Jesuits, a group within the Roman Catholic Church
- Sports Illustrated, a sports magazine