| Acronym | Meaning |
| HEK | Human Embryonic Kidney |
| SPS | Surface Photovoltage Spectroscopy |
| ISLSCP | International Satellite Land Surface Climatology Project |
| GVB | Generalized Valence Bond |
| FI | Field Ionization |
| SSULI | Special Sensor Ultraviolet Limb Imager |
| IF DRM | Inversion-free Direct Recursion Method (for Surface Electronic Structure) |
| RSD | Risk-specific Dose |
| DRIPSS | Drinking Water Information Processing Support System |
| ORBIT | On-line Retrieval Of Bibliographic Information Timesharing |