Square (sq) 1 : A traditional unit of area, often used for measuring roofing material, finished lumber, and other building materials. One square equals 100 square feet, 11.111 square yards, or about 9.290 square meters
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}