Third ("') 1 : A unit of time equal to 1/60 second. The symbol for this rarely-used unit is a triple prime, suggesting a natural progression from the minute (') through the second (") to the third ("')
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}
