| Acronym | Meaning |
| CORMA | COmplete Relaxation Matrix Analysis |
| GISPRI | Global Industrial And Social Progress Institute (Japan) |
| ISFET | Ion-Sensitive Field-Effect Transistor |
| ETO | Elliptical-type Orbital |
| STIG | Steam-injected Gas Turbines |
| APFU | Atoms Per Formula Unit |
| RUP | Rumen-undegradable Protein |
| CEMS | Conversion Electron Moessbauer Spectroscopy |
| PAHO | Pan American Health Organization |
| CIPM | Comite International Des Poids Et Mesures |