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*SI (International System of Units):

A modern, coherent system of measurement units, built around seven base units. The SI is officially adopted by almost every country in the world.

*Metric system:

A system of measurement units based on a limited number of fundamental units, introduced by France in 1799. The metric system is the predecessor of the International System of Units (SI).

*US customary system:

The common measurement system of the United States. This system has derived from the imperial system, but has several significant differences.

*Imperial system:

A British measurement system, first standardized in 1824, based on the standard units yard, pound and gallon.