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S.I. is an abbreviation of Système Internationale or International System: our metric system of measurements. It is an internationally standardised system, giving a common language between nations and between the different branches of science and technology.
The International System of Units (abbreviated SI from systeme internationale , the French version of the name) is a scientific method of expressing the magnitudes or quantities of important natural phenomena. There are seven base units in the system, from which other units are derived.