There is a domain name registrar called Network Solutions (NSI). I think it's Network Solutions Incorporated.

There is another NSI in computer terms and that is Name Service Interface (NSI). Someone else might know more about what that means. If I find some sort of definition I'll post it.

[There is also an NIS (not NSI though).. Network Information Service]

p.s. again... if you ever need to define something, a good trick is to go to google and type in define colon and then the thing you want to find.

"define: the word or phrase"
http://www.google.com.au/search?hl=e...G=Search&meta=