- NAA
- Newspaper Association of America (Community » Media)*** Neutron Activation Analysis (Academic & Science » Physics)* Nothing At All (Academic & Science » Mathematics)* North American Alliance (Governmental » US Government)* National Archery Association (Community » Sports)* National Aphasia Association (Community » Non-Profit Organizations)* National Airspace Analysis (Governmental » Transportation)* Narrabri, New South Wales, Australia (Regional » Airport Codes)* No apparent abnormalities (Medical » Physiology)* Naphtalic Acetic Acid (Academic & Science » Chemistry)* National Association of Accountants (Now IMA) (Business » Accounting)
Abbreviations dictionary. 2012.