An alternate name for what Americans call a mil: a unit of distance equal to 0.001 inch (25.4 micrometers). This name originated in Britain, but it is now common in the U.S. also
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}