NMREC
National Maritime Resource and Education Center
NMRR
normal-mode rejection ratio
NMU
Not much, you?
SMS/Chat: niets bijzonders, jij?
NNE
north-northeast
noord-noordoost - NNO
NNI
network node interface
NNI
National Nanotechnology Initiative
NNI
network-network interface (standard)
NNSA
National Nuclear Security Administration
NNW
north-northwest
noord-noordwest - NNW
no
number
nummer - nr
NOAA
National Oceanic and Atmospheric Administration
NOC
National Occupational Classification
NODC
National Oceanographic Data Center
noob
unexperienced and ignorant
groentje
NOP
no-operation instruction
NOP
National Opinion Polls
opinieonderzoeksbureau
NORAD
North American Aerospace Defense Command
Northants
The county of Northamptonshire
NOS
National Ocean Service
NOS
network operating system
NOSC
Naval Ocean Surveillance Center