Square foot - Wikipedia
https://en.wikipedia.org/wiki/Square_foot
WEBThe square foot (pl. square feet; abbreviated sq ft, sf, or ft 2; also denoted by ' 2) is an imperial unit and U.S. customary unit (non-SI, non-metric) of area, used mainly in the United States and partially in Canada, the United Kingdom, Bangladesh, India, Nepal, Pakistan, Ghana, Liberia, Malaysia, Myanmar, Singapore and Hong Kong.
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