Si

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

Measurement, mathematics and science[edit]

  • International System of Units (Système international d'unités), the modern international standard version of the metric system
  • Signal integrity, electronic circuit tools and techniques that ensure electrical signals are of sufficient quality for proper operation
  • Si, the chemical symbol for silicon
  • Si(x), the sine integral in mathematics
  • Survey of India, an Indian government agency responsible for managing geographical information about India
  • Simple Interest (Mathematics)

Medicine[edit]

Places[edit]

Language[edit]

Computer science[edit]

Education[edit]

Gaming[edit]

Music[edit]

  • Si, the original name of the seventh note of solfege, later changed to "Ti"
  • Sì (song), the name of the Italian entry to the Eurovision Song Contest 1974
  • Sì (Carmen Russo song), the name of the 1985 song released by Italian actress Carmen Russo
  • (album), an album by Mexican singer and songwriter Julieta Venegas
  • Si, another name for the Sídhe, Celtic mythological beings
  • (operetta), an operetta by the Italian composer Pietro Mascagni

Government and politics[edit]

Sports[edit]

Transportation[edit]

Other uses[edit]

See also[edit]