Inertial Navigation System 
Immigration and Naturalization Service 
Infusion Nurses Society 
Inertial Navigation Systems 
institutional net settlements 
Immigration and Naturalization Service… 
Information Network System 
Interoperable Naming Service 
inelastic neutron scattering 
Inertial Navigation Set 
Insley 
Insert Code 
Ion neutralization spectroscopy 
Immigration and Naturalization Service… 
Immigration Naturalization Service 
Incident of National Significance 
Indian Naval Ship 
Inertial Navigational System 
Input String 
Institute for Nuclear Studies 
insulin 
insurance 
Integrated Network Server 
Integrated Network System 
Integrated Nitrogen System 
Intelligent Networks 
Inter Networking Systems 
International Net Settlement Service 
International Network Services 
International Numbering System