| Acronym | Meaning |
 | RIOMETER | Relative Ionospheric Opacity Meter |
| CAWAI | Commission On Atomic Weights And Isotope Abundances |
| PSU | Practical Salinity Units |
| SNO | Sudbury Neutrino Observatory |
| BIOS | Biological Innovation For Open Society |
| CCBP | Coal Combustion By-product |
| TEL | Tetraethyl Lead |
| AER | Atmospheric And Environmental Research |
| HQSAR | Holographic Quantitative Structure-activity Relationship |
| RPI | Radius Polydispersity Index |
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