| Acronym | Meaning |
| LSA | Local Space Approximation |
| ESES | Environmental Sampling Expert System |
| PET | Potential Evapotranspiration |
| PTCR | Positive Temperature Coefficient Of Resistance (of Semiconductors) |
| GPHS | General Purpose Heat Source |
| RDF | Radial Distribution Function |
| UGLCC | Upper Great Lakes Connecting Channels |
| SVM | Support Vector Machine |
| LTP | Long-term Potentiation |
| SIEC | Spherical Inertial Electrostatic Confinement |