| Acronym | Meaning |
| APOMA | American Precision Optics Manufacturers Association |
| PRM | Primary Reference Material |
| ERFEN | Estudio Regional Del Fenomeno El Nino |
| TH | Total Hardness [of Water] |
| GRP | Glass Reinforced Plastic |
| AMIA | American Medical Informatics Association |
| FDS | Field Desorption Spectrometry |
| PDQ | Physician Data Query |
| GHRF | Growth Hormone-releasing Factor |
| NODS | NASA Ocean Data System |