A traditional unit of volume in Bulgaria, now expressed in the metric system as being equal to exactly 20 liters (4.40 British Imperial gallons or 5.28 U.S. liquid gallons)
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}