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by IndrekR 276 days ago
It is to avoid confusing with "M", mīlle -- Latin for "thousand". Quite common in financial world still.
1 comments

I've worked in trading in NY, London, and Singapore for nearly 20 years and have never seen anyone actually write M to mean "thousands".

"Thousand" is always "k" or "K". "Million" is "M", "MM", "m", "mn", or "mln".