A Customary Unit or non-SI unit is a measurement unit that is not part of the metric system.
Customary units are mainly units of the Imperial system but they could be localised customary units - such as Gaj (for area) is South Asia.
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It is a customary unit.
The pound is NOT a metric unit.
it is a customary unit
The yard is an English, or customary unit.
The customary unit would be miles (mi), and the metric unit would be kilometers (km).