| Acronym | Meaning |
| PNA | Paraffins, Naphthenes, And Aromatics (in Petroleum Analysis) |
| RNA | Remediation By Natural Attenuation |
| FML | Flexible Membrane Liner |
| FET | Field Effect Transistor |
| TSEE | Thermally Stimulated Exoelectron Emission |
| GEO | Geostationary Earth Orbit |
| NAPRI | North American Pollutant Release Inventory |
| MRSI | Magnetic Resonance Spectroscopic Imaging |
| ERP | Event-related Potential |
| FTP | US Federal Test Procedure (for Exhaust Catalysts) |