American Nuclear Society 
Autonomous Navigation System 
American National Standard 
answer 
Astronomical Netherlands Satellite 
Autonomic Nervous System 
Ansaldo 
Advanced Network and Services 
Advanced Neutron Source 
Air Navigation School 
Air Navigation Services 
American National Standards 
aquatic nuisance species 
Astro News Service 
Astronomische Nederlandse Satelliet 
Advanced Network & Services 
Advanced Network Services 
Advanced Networking Services 
Advanced Networks and Services 
Answer Message 
Area Navigation System 
ATM Network Switch 
Automatic Network Shutdown 
Autonomous Navigational System 
Académie National de Sciences 
Academy of Natural Sciences 
Access Networks 
acoustic neuromas 
Action National Settlement 
active nephrotic syndrome