| Acronym | Meaning |
| PIXIE | Polar Ionospheric X-ray Imaging Experiment |
| PHT | Pulmonary Hypertension |
| SOR | Surface Overflow Rate |
| FCC | Food Chemicals Codex |
| ASI | Advanced Study Institute (NATO) |
| RMP | Radon Measurement Proficiency |
| LCGDO | Linear Combination Of Generalized Diatomic Orbitals |
| ICMA | Immunochemiluminometric Assay |
| MQDT | Multichannel Quantum Defect Theory |
| ECQB | Electrochemical Quartz Crystal Balance |