| Acronym | Meaning |
| EMPT | Effective Medium Percolation Theory |
| ISES | International Solar Energy Society |
| ARM | Area Radiation Monitoring |
| ICTA | International Confederation Of Thermal Analysis |
| TWTA | Traveling Wave Tube Amplifier |
| CLU-IN | Clean-Up Information Bulletin Board System (formerly OSWER-BBS) |
| TEC | Teo Electron Counting Method (for Complexes |
| NLAP | Nonlimited Aeration Process (for Waste Treatment) |
| BOCV | Biorthogonality Constrained Variation Method |
| BHT | Bottom-hole Temperature |