A square unit is equal to the area of a square with each side measuring 1 unit.
In the U.S. customary system of measurement, commonly used square units include square inches (in2), square feet (ft2), square yards (yd2), and square miles (mi2).
In the metric system of measurement, commonly used square units include square centimeters (cm2), square meters (m2), and square kilometers (km2).
Although a square unit of area may be in the shape of a square, it can take other shapes.
Also written as sq unit.
See also area, square feet, square inches, square kilometers, square meters, square miles, square yards.