| Acronym | Meaning |
| HDD | Hard Disk Drive |
| RBM | Radial Breathing Mode |
| TOVS | TIROS Operational Vertical Sounder |
| NTO | Natural Transition Orbital Method (for Excited States) |
| FRAM | Fine Resolution Antarctic Model |
| ISI | Institute For Scientific Information |
| ESQUIRE | External Source QUIstor With Resonance Ejection |
| ECTR | Extended Connection Table Representation |
| ERLN | Environmental Research Laboratory Narragansett |
| TLM | Triple Layer Model (of Adsorption) |