**International System of Units - Wikipedia**
https://en.wikipedia.org/wiki/International_System_of_Units

OverviewIntroductionControlling authority Units and prefixesLexicographic conventionsInternational System of QuantitiesRealisation of unitsEvolution of the SIThe International System of Units, known by the international abbreviation SI in all languages and sometimes pleonastically as the SI system, is the modern form of the metric system and the world's most widely used system of measurement. Established and maintained by the General Conference on Weights and Measures (CGPM ), it is the only system of measurement with an official status in nearly every country in the world, employed in science, technology, industry, and everyday com…

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