| Acronym | Meaning |
| UTP | Unitary Transformation (based) Perturbation (theory) |
| IAEH | International Association For Environmental Hydrology |
| ACTH | Adrenocorticotrophic Hormone (reg:9003-56-9) |
| AR | Androgen Receptorpar |
| FECS | Federation Of European Chemical Societies |
| BAT | Back Arc Tectonics |
| CDF | Cumulative Distribution Functions |
| ATES | Aquifer Thermal Energy Storage |
| TEEL | Temporary Emergency Exposure Limit |
| STP | Slater-transform-preuss (wave Functions) |