NASA
National Aeronautics and Space Administration.
Nocturnal Light
See the Hynek Classification System.
Nocturnal Disc
See the Hynek Classification System.
Nordic
According to the MJ-12 itīs an alien race with blond hair an human like body.
NRO
National Reconnaissance Office, (or National Recon Organisation). Itīs responsible for security for all alien or alieen crafts connected profets.