A traditional unit of distance equal to 1000 feet or exactly 304.8 meters. This odd combination of a metric prefix and an English unit is used in telecommunications to describe cable lengths and transmission distances
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}