| Acronym | Meaning |
| PSXD | Position Sensitive X-ray Detector |
| ACCP | Atlantic Climate Change Program (of NOAA |
| TS | Transition State |
| HQE | Hemiquantal Equations |
| TERT | Telomerase Reverse Transcriptase |
| NSH | Normalized Spherical Harmonic (hamiltonian) |
| ETB | Extended Tight-binding (method For Electronic-structure Calcns.) |
| ESE | Electron Spin Echo |
| PAIS | Public Affairs Information Service |
| MOPA | Master Oscillator Power Amplifier |