Quit rates
As a purist you are correct about 4MM, but over time the "purity" factor has slipped, considerably, and a hybrid, if you will, has emerged wherein people use "M" for "million" and whatever number they need to represent how many, not using an appropriate Roman configuration. "K" seems to be what is used instead of "M" when trying to indicate "thousands", along with the appropriate number to represent how many. Trying to represent a large number using the correct Roman numeral configuration would get rather cumbersome for everyday use and simplicity.
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