National Basketball Association 
Net Book Agreement 
National Basketball Association's 
National Board of Aviation 
National Business Association 
Nominated Barring Authority 
Narrow-Beam Absorption 
National Bankers Association 
National Base station 
National Beef Association 
National Bison Association 
National Boxing Association 
National Brassfounders Association 
National Buffalo Association 
National Building Agency 
National Bulldogge Association 
NATO Board of Auditors 
N-bromoacetamide 
n-butyl acrylate 
n-butyl alcohol 
Nepal Bar Association 
net building area 
Network Behavior Analysis 
Neuromuscular Blocking Agent 
New Beginnings Academy 
None-Blocking Architecture 
number born alive 
number of piglets born alive 
number of pigs born alive 
number of pups born alive