| Acronym | Meaning |
| UTL | Upper Tolerance Limit |
| UNAMAP | Users' Network For Applied Modeling Of Air Pollution |
| EGU | European Geosciences Union |
| ASX | Aluminosilicate Xerogel |
| BCO | Bounded Crystal Orbital |
| RSP | Respirable Suspended Particulates |
| ECM | Embedded Cluster Method (in Electronic-structure Calcns.) |
| MOEXP | Morse Oscillator Exponential Repulsion Potential |
| JOSO | Joint Organization For Solar Observations |
| OAW | Oxyacetylene Welding |