| Acronym | Meaning |
| OPIT | Oxide Powder In Tube |
| IDOE | International Decade Of Ocean Exploration |
| OCCSD | Open-shell Coupled-cluster (with) Single (and) Double (excitations) |
| VDRE | Vitamin D-responsive Element |
| AARC | Alliance For Acid Rain Control |
| MOSQITO | Modeling Of Stormwater Quality Including Tanks And Overflows |
| LICS | Laser-induced Continuum Structure |
| ABR | Anaerobic Baffled Reactor (for Wastewater Treatment) |
| AR | Androgen Receptorpar |
| SASS | Source Assessment Sampling System |