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The pound was a unit of weight measurement on Earth.

The unit was in wide use in at least the United States of America well into the 21st century. Jack Harkness for instance, once gave Massachusetts-born Janet Rae Tanner's weight in pounds in 2011, suggesting that this was the weight measurement in most common use in America. (TV: The Middle Men)

The sonic sunglasses measured an individual's weight in pounds. (TV: The Pyramid at the End of the World)