| Acronym | Meaning |
| TRS | Total Reduced Sulfur |
| ECP | Effective Core Potential Approxn.(in Electronic-structure Calcn.) |
| GPCP | Global Precipitation Chemistry Program |
| PMAD | Power Management And Distribution (system) (of Space Station) |
| EGR | Exhaust Gas Recirculation |
| NFAIS | National Federation Of Abstracting And Information Services |
| NACA | National Agricultural Chemicals Association |
| ERPF | Effective Renal Plasma Flow |
| PAC | Photoacoustic Calorimetry |
| TCDFT | Two-component Density Functional Theory |