General. A prefix signifying the one-millionth part, e. g. micro-ampere, one-millionth of an ampere; microfarad, one-millionth part of a farad. Prefix symbol: µ
H. J. Porter (Chairman - Technical Committee), Dictionary of Fire Technology, The Institution of Fire Engineers, The Victory Press (Leicester) Ltd. 1979 UK. (Fr Tech - Brit) {81}