National Ocean Service 
Network Operating System 
Not Otherwise Specified 
National Ocean Survey 
Network Operating Systems 
nitric oxide synthase 
network operators 
New Old Stock 
Naval Ordnance Station 
Network Operation System 
Night observation system 
Nitric oxide synthetase 
Not on Schedule 
NADPH-diaphorase 
Nanos 
National Occupational Standards 
National Oceanic Service 
National Open School 
National Operating Services 
National Operational Satellite 
National Osteoporosis Society 
NATO Office of Security 
Naval Ocean Systems 
Neos 
Network Optimization Support 
Network OS 
Networking Operating System 
Nevada Ophthalmological Society 
New Orleans Square 
Next On Stack