It's the abbreviation of feet or foot used as a unit of measure.
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It is a symbol for square feet and is a measure of area in the mostly obsolete Imperial System of measurement.
82,653,950,016
It is square ft.
920 sq. ft.
15 ft * 15 ft = 15*15 sq ft = 225 sq ft
16 ft * 25 ft = 16*25 = 400 sq ft.