NSI

from The Free On-line Dictionary of Computing (8 July 2008)

Network Solutions, Inc.
NSI

   <company> (NSI) One of the three companies that provide and
   coordinate {InterNIC} services for the {NSFNet}.  NSI is
   responsible for registration.  NSI has been bought by, and is
   now a wholly-owned subsidiary of, {Science Applications
   International Corporation} (SAIC).

   (1995-11-09)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

NSI
       Name Service Independent (DCE/RPC, CDS)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

NSI
       NASA Science Internet (NASA, network)