No Internal Message

Used at end of the subject line in an e-mail to indicate there is no internal message or nothing in the body.

Online jargon, also known as text message shorthand, used in texting, online chat, instant messaging, email, blogs, and newsgroup postings, these types of abbreviations are also referred to as chat acronyms

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See also : IAITS  N/T  DRIB  EOM  
NetLingo Classification: Acronyms and Text Message

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