| Abbreviation | Definition |
|---|---|
| IAS | Inertial Active Suspension |
| IAVCEI | International Association of Volcanology and Chemistry of the |
| IB | International Baccalau |
| IB | Ion Balance |
| IB | Isospin Breaking |
| IC | Isotope Container |
| ICAD | Individual Chemical Agent Detector |
| ICAM | Improved Chemical Agent Monitor |
| ICAT | Isotope Coded Affinity Tag |
| ICCA | International Council of Chemical Associations |
| ICCP | Impressed Current Cathodic Protection |
| ICCT | International Chemical Control Toolkit |
| ICD | IsoCitric Dehydrogenase |
| ICE | Initial Change Equilibrium |
| ICEF | Illinois Chemical Education Foundation |
| ICET | Institute of Chemical Engineering and Technology |
| ICFA | Internal Carbonated Fatty Acid |
| ICI | Imperial Chemical Industries ( ICI, England) |
| ICIG | International Chemical Investors Group |
| ICN | International Chemical And Nuclear |