| Acronym | Meaning |
| MTEL | Maximum Tolerable Exposure Levels |
| ERFEN | Estudio Regional Del Fenomeno El Nino |
| RIGS | Radioimmunoguided Surgery |
| DFG | Difference Frequency Generation |
| WCBP | Well Characterized Biotechnology Pharmaceuticals |
| DIU | Data Information Unit (of WOCE Data System) |
| LMW | Low Molecular Weight |
| ARSPIPES | Angle Resolved Spin Polarised Inverse Photo Emission Spectroscopy |
| APL | Alternative Pollutant Limits |
| SPECT | Single Photon Emission Computerized Tomography |