Abkürzungen/I

 i.a.W.  in anderen Worten
 IBM     International Business Machines
 ICE     Intercity Express
 ie      id est, that is
 i.O.    in Ordnung
 IHK     Industrie(-?) und Handelskammer
 Ing.    Ingenieur
 INRI    Iesus Nazarenus Rex Iudaeorum
 IR      infrarot
 IRA     Irish Republican Army
 ISBN    Internationale Standardbuchnummer
 ISDN    Integrated Services Digital Network
 ISSN
 IUPAC   International Union of Pure and Applied Chemistry