List of abbreviations: N

NAIC National Astronomy and Ionosphere Center (USA)
NARFA National Allied Radio Frequency Agency
NAS National Academy of Sciences (USA)
NASA National Aeronautics and Space Administration (USA)
NASDA National Space Development Agency of Japan
NATO North Atlantic Treaty Organization
NAVSTAR see GPS
NAVTEX Narrow-band direct-printing telegraphy system for transmission of navigational and meteorological warnings and urgent information to ships
NESS National Environment Satellite Service (of NOAA)
NEST Nuclear Emergency Search Team (USA)
NFRA Netherlands Foundation for Research in Astronomy (NL)
NGO Non Governmental Organization
NGSO Non-Geostationary Satellite Orbit
NIST National Institute of Standards and Technology (USA)
NIVR Nederlands Instituut voor Vliegtuigontwikkeling en Ruimtevaart (NL)
NJFA NATO Joint Civil/Military Frequency Agreement
NMR Network Meter Reading
NNSS Navy Navigational Satellite System (USA)
NOAA National Oceanographic and Atmospheric Administration (USA)
NRAL see JBO
NRAO National Radio Astronomy Observatory (USA)
NRC National Research Council (USA)
NSF National Science Foundation (USA)
NTIA National Telecommunications and Information Administration (USA)
NV/NG Non-voice/Non-geostationary
NWS National Weather Service (USA)