| Abbreviation | Definition |
|---|---|
| IPRM | Indium Phosphide Related Material |
| IPS | In Panel Switching |
| IPT | Ideal Process Time |
| IPT | Internal Power Transmission |
| IPVD | Interior Physical Vapor Deposition |
| IPVDC | Interior Physical Vapor Deposition Coating |
| IQE | Institute for Quantum Electronics |
| IQE | Institute of Quantum Electronics |
| IR | Infrared |
| IRAMS | Infrared Automatic Mass Screening |
| IRAS | Infrared Reflection-Absorption Spectroscopy |
| IRE | Institute of Radio Engineers |
| IREA | Intermountain Rural Electric Association |
| IREM | International Rental Electronics Machines |
| IRF | Instrument Response Function |
| IRF | Instrumental Response Function |
| IRF | Iterative Reach Frequency |
| IRFOC | Indirect Rotor Field-oriented Control |
| IRFPA | Infra-Red Focal Plane Array |
| IRIMEE | Indian Railway Institute of Mechanical and Electrical Engineering |