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| English | Thesaurus |
| Infra-Red Analysis Measurements & Modeling Program | IRAMMP (US Navy) |
| Infra-red Chemistry Experiments, Co-ordinated Auroral Program | ICE CAP (USA) |
| Infra-Red Missile Warning Subsystem programme | IRMWS (USA) |
| Intensity Red Green Blue | IRGB (Vosoni) |
| Junior Red Cross | JRC |
| Silicon Hybrids with Infra-red Extrinsic Long wavelength Detectory programme | SHIELD (USAF) |