I3

I3, I-3 or i3 can stand for:
* I3 engine, a designation for a in-line 3-piston engine
* HIJMS I-3, a WWII Imperial Japanese Navy J1 type submarine
* LB&SCR I3 class, a British
* Polikarpov I-3, a 1928 Soviet biplane fighter

and also :
* Innovative Integration, Inc., an Indianapolis based network integration firm
* a Symantec software product
* the Overlay network [http://i3.cs.berkeley.edu/ Internet Indirection Infrastructure] (i3)
* Interactive Intelligence, Inc., an Indianapolis based software company
* a Canadian IBM Business Partner located in Toronto
* Interactive Introduction to the Intstitute, a series of videos about residential life at various living groups at MIT
* Triiodide
* Integrated Imagery and Intelligence, part of the United States military's Global Command and Control System
* Interstate 3, the Third Infantry Division Highway, a proposed Interstate Highway in the United States to run from Savannah, Georgia north to Augusta, Georgia and Knoxville, Tennessee