| Acronym | Meaning |
 | PEFR | Peak Expiratory Flow Rate (lung Function) |
| WHH | Width At Half Height [in X-ray Diffraction] |
| NO | Natural Orbital |
| PQL | Practical Quantitation Levels (of Pollutants |
| CSIRO | Commonwealth Scientific And Industrial Research Organization |
| ESQUIRE | External Source QUIstor With Resonance Ejection |
| EC | European Community |
| BEC | Bose-Einstein Condensation |
| DNS | Direct Numerical Simulation |
| DO | Diatomic Orbital |
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