what does SI? unit mean?

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The International System of Units abbreviated SI from Frecnch Système international d'unités. It is the system of units of measurment which is divided into 7 fundamental units i.e. Mass-kilogram, Lenght-Meter, Time-second, Electric current-Ampere, Temprature-Kelvin, Amount of substance-mole, Intensity of light-Candela. Hope this worked for u. For more, just google it.