It is the International System of Units, which gets its abbreviation from its French name: Systeme (first e with a grave accent) international d'unites (e with an acute accent).
A kilometre is a measurement in the SI system.
the si system of measurement is the standard set of units accepted throughout the world.
The base SI unit of distance is the meter.
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Most of the world uses the metric system for measurement.
The metric system uses kilograms as a unit of measurement for mass.
SI stands for Systeme International which is the metric system of measurement.
SI: The measurement system that is accepted world wide.
SI stands (in French) for Système international d'unités, the International System of Units [of measurement].
The SI (International System of Units), and the Metric System.
the si system of units
Officially the metric SI system.