English

1. Noon, See Google search for "12 NN" for examples

Abbreviation

1. an anonymous person.
2. net neutrality, network neutrality
3. Not Now, commonly used as internet slang
4. "No name", nickname for unreleased songs without an official title
5. Night Night - an acronym used on instant-messaging boards for the phrase "night night"
6. Nice "Nade" - Used for games in which have nades (A.K.A. grenades)