| Acronym | Meaning |
| PEN | Personal Electronic Notebook |
| TSSMS | Time Sharing Service Management System |
| MMR | Mismatch Repair |
| CRISTA | Cryogenic Infrared Spectrometers And Telescopes For The Atmosphere |
| CLTE | Coefficient Of Linear Thermal Expansion |
| UOP | Universal Oil Products |
| UCL | Upper Confidence Limit |
| NEEIA | Nonseparation Electrochemical Enzyme Binding/immunoassay |
| SMF | Standard Monitoring Framework |
| NAMA | National Air Monitoring Audits |