M after a number
Question from Larry:
I have heard that Million is annotated as MM. But I have heard two answers for Thousands (K, M). Which is correct?
I have not seen MM as an abbreviation for million but I did find a reference to it in Wikipedia.
M is the Roman numeral for 1,000 but in the metric system M designates the prefix mega- which is a million. For example MW is a megawatt. On the other hand m designates milli- or one thousandth so mm is a millimetre or 0.001 metres.
To minimize confusion I would stick with K for a thousand. K comes form the Greek kilo which means a thousand. In the metric system lower case k designates kilo as in kg for kilogram, a thousand grams. Even here there is some ambiguity. In the language of computer science K is 2 10 = 1024.
M after a number Question from Larry: I have heard that Million is annotated as MM. But I have heard two answers for Thousands (K, M). Which is correct? I have not seen MM as an
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