Turn off the television and teach your children how to think.
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*I do not read or write anything in the "Comments" section.*
It could stand for any number of things.
Without knowing the context in which you found it, I cannot give you a specific answer. However, there follows a link to a dictionary of acronyms so you may look it up for yourself. Simply type 'PMN' into the search line.
www.all-acronyms.com
