| Acronym | Meaning |
| RF | Response Factor |
| PPAC | Parallel-plate Avalanche Counter |
| GO | Generalized Overlap |
| CCFL | Countercurrent Flow Limitation |
| CCC | Copyright Clearance Center |
| ETF | Exponential-type Function (an Ao) |
| SEL | Stacked Elemental Layer (vapor Deposition Technique) |
| LMR | Laser Magnetic Resonance |
| ECS | Electroconvulsive Shock |
| MRSI | Magnetic Resonance Spectroscopic Imaging |