Carl Sorenson wrote in USMA 24091:
In the U.S., Mg would be guaranteed to be confused with mg. Many of you are concerned about confusion from overly precise package labels, but this would be a much more serious confusion.
I think think the danger is infinitesimal.
1 000 000 000 mg = 1 Mg
International Standard ISO 2955 recommends the use of "ma" as the symbol for mega with systems that have only lower case characters, and "MA" as the symbol when the system has only upper case letters.
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Joseph B. Reid
17 Glebe Road West
Toronto M5P 1C8 Telephone 416-486-6071
