| Acronym | Meaning |
 | PTRI | Programmed Temperature Retention Index |
| CACGP | Committee On Atmospheric Chemistry And Global Pollution |
| MBBR | Moving Bed Biofilm Reactor |
| PIRSS | Polarization IR Surface Spectroscopy |
| APOMA | American Precision Optics Manufacturers Association |
| HTMR | High Temperature Metal Recovery |
| PMAD | Power Management And Distribution (system) (of Space Station) |
| VGAO | Variable Gage Atomic Orbital |
| 2DEG | Two-dimensional Electron Gas |
| GHR | Growth Hormone Receptor |
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