Definition from Wiktionary, the free dictionary
See also: Appendix:Variations of “si”
- The ISO 3166-1 two-letter (alpha-2) code for Slovenia.
- The abbreviation for Système International d'Unités or the International System of Units, commonly known as the metric system.
- Smithsonian Institution
- (electronics) Signal integrity
- (technology) Systems integration
- (fandom slang) self-insertion (of the author into fan fiction)
- Sinaloa (Mexican state)