A unit of magnetic flux density equal to 0.001 gauss, 0.1 microtesla, or 100 nanoteslas. The magnetic fields generated by power lines and electronic equipment are often measured in milligauss
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}