| Meaning | Category |
| Butyl Rubber | Miscellaneous->Plastics |
| IRI International Corporation | Business->NYSE Symbols |
| Industrial Information Resources | Business->Firms |
| Infinite Impulse Response | Academic & Science->Electronics |
| Intelligence Information Report | Governmental->Military Governmental->US Government |
| Intermediate Information Requirement | Governmental->Military |
| Internal Intermediate Representation | Computing->General |
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