| Acronym | Meaning |
| IIR | Isobutylene Isoprene Rubber |
| NIHHS | Notification Of Installations Handling Hazardous Substances Regulations (UK) |
| HVIC | High-voltage Integrated Circuit |
| IAQ | Indoor Air Quality |
| TOVS | TIROS Operational Vertical Sounder |
| ECWR | Electron Cyclotron Wave Resonance |
| MM | Misch Metal |
| SHR | Selective Hybrid Reduction |
| MRLCC | Multireference Linearized Coupled Cluster |
| IGES | Institute Of Global Environment And Society |