| Acronym | Meaning |
| RPS | Reemitted Positron Spectroscopy |
| GRIN | Gradient Refractive Index |
| RLP | Reactive Liquid Polymer |
| DRI | Direct Reduced Iron |
| BRE | Bond Resonance Energy |
| SMO | Sample Management Office (US EPA) |
| STEP | Soil Treatment Evaluation Program |
| EID | Environmental Improvement Division |
| RSNA | Renal Sympathetic Nerve Activity |
| MEF | Mouse Embryonic Fibroblast |