LogGrad98
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doesn't k mean 1000 and m is the inverse (.001)
like a kilometer is 1000 meters and a millimeter is 1/1000 of a meter
same thing with grams - kg is kilograms (1000 grams) and mg is milligrams (.001 grams)
And Roman numerals aren't the same as the metric system so that's why m in Roman Numerals is different than m in the metric system
For America it's actually the computer world that brought about the wide spread use of K as a designator of 1000. Before the 70's really using M was far more common since at that time Roman numerals were actively taught in schools and much better known. In other countries the K as a symbol for kilo has been much more common for a longer time but since we haven't fully adopted the metric system K for us as 1000 came about from kilobyte in computer parlance moreso than metric. Ironically 1 kilobyte is not really 1000 bytes. It us 1024.
https://pc.net/helpcenter/answers/why_1024_bytes