A symbol for the Latin quaque, "every," often used in medical prescriptions and orders. The symbol is used in combinations such as q8h, "every 8 hours," or q2d, "every other day"
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}