1. [abbreviation] (metrology) Symbol for the nanogram, an SI unit of mass equal to 10?9 grams.
2. [symbol] The ISO 3166-1 two-letter (alpha-2) code for Nigeria.
3. [abbreviation] (petrochemistry) natural gas
4. [abbreviation] (Internet) newsgroup
5. [abbreviation] (Internet) Newgrounds
6. [noun] One billionth (1/1,000,000,000) gram.
