| Acronym | Meaning |
| OTIS | One-dimensional Transport With Inflow And Storage |
| GOCE | Gaussian Overlap Potential With Const. Well Depth |
| FGDIS | Flue Gas Desulfurization Information System |
| ABMA | American Boiler Manufacturers Association |
| SC-1 | Standard Clean Solution #1 |
| CASTNET | Clean Air Status And Trends Network |
| BAHC | Biospheric Aspects Of The Hydrological Cycle |
| OCTA | Oxidizing Capacity Of The Tropospheric Atmosphere |
| ICRF | Ion Cyclotron Range Of Frequencies |
| TH | Total Hardness [of Water] |