Not to seem silly, but I have seen the acronyms NMM and digits.  They are not listed on the abbreviations list (that I saw).

Help please.

Will TRY to help, but need more info.  Where did you see it - board, review etc?  Can you provide a link to the posting?  What was context?  Could be anything from something made up, a typo for MMMMMM etc... could even be

..Someone's phone number.  Popular in rap songs.  It was actually used in the song Shoop by Salt-and-Pepa years ago

"I'm not shy so I asked for the digits"

http://www.ntl.matrix.com.br/pfilho/html/lyrics/s/shoop.txt

Help.

Thanks.

Perhaps you could link to a few of these reviews?  Nobody here is going to search through thousands of reviews to see the context of the acronym.  You need to help us help you!

Either links to reviews, or the names and cities of the providers... since the letter appeared IN a review, you can easily sent internal mail to the reviewer to ask... but now you have our curiosity aroused.. NPI