MN is not an abbreviation for millions.
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1 m or 1M, and less commonly, 1 mn or 1 Mn.
In the financial world, MM typicall stands for millions (i.e $100MM would be $100 million).
The abbreviation for abbreviation is "abbr."
"GPA" is already an abbreviation for "grade point average". There is no further abbreviation for the abbreviation.
Yes, abbr is the abbreviation of the word abbreviation or abbreviate.