| Abbreviation | Definition |
|---|---|
| IPL | Intense Pulsed Light |
| IPM | Ionization Profile Monitor |
| IPP | Institute for Particle Physics |
| IPP | Institute for Plasma Physics |
| IPP | Institute of Particle Physics |
| IPP | Institute of Plasma Physics |
| IPP | Institute of Practical Psychophysics |
| IPPP | Institute for Particle Physics Phenomenology |
| IPS | Impulsive Phase Start |
| IPS | Inverted Polygon Shield |
| IPT | Inductive Power Transfer |
| IQ | isoperimetric quotient |
| IQI | Image Quality Indicator |
| IR | Interface Region |
| IRASC | Interventional Radiology ASC |
| IRCEP | International Research Centre for Experimental Physics |
| IRCEP | International Research Centre in Experimental Physics |
| IRIS | Integrated Radiation Information System |
| IRIS | Internal Rotary Inspection System |
| IRIS | International Reactor Innovative and Secure |