Is the International System of Units called “SI” (pronounced ess-eye) in all languages?
The name “The International System of Units” is, of course, translated appropriately in different languages. But it’s useful to have a standard, international abbreviation, and that’s “SI” (all caps, no periods), derived from the French «Le Système International d’Unités» but used in all languages. Generally, when used as a noun the abbreviation “SI” is preceded by the: “In the SI, the value of the velocity of light in vacuum is c = 299 792 458 m/s exactly.” References: SI Brochure §1.2 • SI Brochure, Appendix 1, 11th CGPM, 1960, Resolution 12 • ISO 31-0 §2.3.2 • IEEE/ASTM SI-10 §1.
