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Look up si, Si, SI in Wiktionary, the free dictionary.

Si, si, or SI may stand for:

• one of two Italian words pronounced like "see":
  • sì (accented) for "yes" and
  • si (unaccented), a pronoun
• one of two Spanish words pronounced like "see":
  • sí (accented) for "yes" and
  • si (unaccented) for "if"
• a French word pronounced like "see" meaning "yes, on the contrary", "as," "however," "so" and "if."
• in Mohican mythology, Si, the lunar deity
• The Si is a self-replicating artifact in the roguelike game Ancient Domains of Mystery
• The mythological being Sídhe.

• Sí, an album by Mexican singer and songwriter Julieta Venegas

• .si, the Internet country code top-level domain (ccTLD) for Slovenia.
• The International System of Units, the modern international standard version of the metric system; SI being the abbrieviation of its French title, Système International d'Unités
• Seletar Institute, a defunct centralised institute in Singapore; one of the original 4 CIs.
• Station Inspector the highest non-commissioned officer rank in the Singapore Police Force.
• in British law, a Statutory Instrument
• Samahang Ilokano, a fraternity/sorority based in the Philippines.
• Smithsonian Institution
• Socialist International
• Spokane International Railroad (AAR reporting marks SI)
• Sports Illustrated
• Sports Interactive
• Signal integrity
• Situationist International
• Staten Island, a borough of New York City and an island in the Hudson River
• Survey of India, an Indian government agency responsible for managing geographical information about India.
• Swedish Institute (Svenska institutet)
• System integrator
• Supplemental Instruction
• Sexual Intercourse (medical abbreviation, not common usage)
• Self-injury or self-harm
• SI is the acronym for Swarm Intelligence or Synthetic Intelligence
• The Shift in control code in the C0 control code set.
• Service Information, a type of metadata packet in a MPEG-2/DVB stream.
• Scouting Ireland
• Sensory integration
• Senior 1 (grade 9)
• Simon
• Sørvágs Ítróttarfelag

• Si is the chemical symbol for silicon
• in music, Si, the original name of the seventh note of solfege; it was later changed to "Ti"
• Sinhalese language, (ISO 639 alpha-2)
• Slovenia (ISO 3166-1 alpha-2 country code, SI)
• In mathematics, si or Si is the Sine integral
• the IATA code for Skynet Airlines
• The Si designation is used by Honda to denote high-performance variants of models they manufacture

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