1) Floor space unit 2) Unit of area 
The square foot (plural square feet; abbreviated ft2 or sq ft) is an imperial unit and U.S. customary unit (non-SI, non-metric) of area, used mainly in the United States, Canada, United Kingdom, Bangladesh, India and Pakistan.{cn|date=August 2013} It is defined as the area of a square with sides of 1 foot. A symbol for square foot, square feet, an...
A size measurement of floor space occupied by a product or product group, display fixtures and its share of aisle space. 
Coverage measured by multiplying width by length. An area 5 foot long and 7 foot wide is equal to 35 square foot. 
[n] - a unit of area equal to one foot by one foot square
sq ft noun a unit of area equal to one foot by one foot square