| Acronym | Meaning |
| RSR | Rapid Solidification Rate |
| HTML | Hypertext Markup Language |
| NTSB | National Transportation Safety Board |
| SED | Surface-conduction Electron-emitter Display |
| UAPS | Utility Acid Precipitation Study |
| MIP | Major Intrinsic Protein |
| OMP | Optimized Model Potential |
| CPAA | Charged Particle Activation Analysis |
| EAA | Excitatory Amino Acid |
| NTU | Number Of Transfer Units (in Packed Tower Aeration System) |