| Acronym | Meaning |
 | AVHRR | Advanced Very High Resolution Radiometer (NASA) |
| SXRFMA | Synchrotron X-ray-fluorescence Microanalysis |
| EHN | Environmental Health Network |
| CEI | Committee On Environmental Improvement |
| SC-HL | Self-consistent Heitler-London |
| GEOS | Goddard Earth Observing System |
| SRP | Spreading Resistance Profiling |
| GRWA | Generalized Rotating-wave Approxn. (in Energy Level Calcns.) |
| OLPA | Orbital Local Plasma Approxn. (in Stopping Power Calcn. For Ions By Films) |
| FRC | Frozen Core Approxn. |
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