What does the unit SQ represent?

The unit SQ is commonly used to refer to a measurement of area in square feet. Specifically, it represents 100 square feet. This unit is often applied in various contexts related to real estate and construction, where areas of spaces are frequently described in terms of square footage. By using the term "SQ," it allows for a more efficient way to communicate larger areas without having to specify the full numerical representation of square footage.

In this context, knowing that "SQ" stands for an area measurement of 100 square feet helps with understanding how space is quantified in construction, permitting calculations for materials, space planning, and assessing properties. The other options relate to units of area in different measurements, such as square inches or square centimeters, which are not applicable when SQ is specifically identified as square feet in this scenario.