What is a square foot?

A square foot or sq ft is an imperial unit of area that is widely used in the United States, Canada, China, and the United Kingdom. Its symbol is a simple square with a vertical line bisecting it (⏍), commonly used in many branches, such as architecture, real estate, and interior space plans. It may also be occasionally written as a square with a slash through it. Its abbreviation is commonly written as sqft or sq ft.

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