| Acronym | Meaning |
| IUPS | International Union Of Physiological Sciences |
| MERIT | MERIT |
| DSRS | Data Storage And Retrieval System |
| D/L | Downlink |
| PD | Positive Definite |
| EAR | Ethics Advisory Review |
| IEA | International Energy Agency |
| NAPAP | National Acid Precipitation Assessment Program |
| NRE | Notice Of Revised Estimate |
| LOHSS | Local Hardware And Software Systems |