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It is a customary unit.
The pound is NOT a metric unit.
some items that are measrued in US customary are the yards on a football field, and the the length between the bases in baseball.
Metric.
how big is your classroom? usually it is measured in yards most room area is actually measured in square feet in the US (which I presume is where your from as you are using yards as a measurement.) in metric regions it is measured in square meters. for reference, do a search on house floor plans.