| Acronym | Meaning |
| STECS | Solar Thermal Electric Conversion Systems |
| PVR | Pulmonary Vascular Resistance |
| MOVFF | Modified Orbital Valence Force Field |
| ACPQ | Approx. Coupled-pair (theory Cor. For Connected) Quadruply (excited Clusters) |
| RFCCU | Residue Fluid Catalytic Cracking Unit |
| MIC | Microbially Induced Corrosion |
| NFCR | National Foundation For Cancer Research |
| SPS | Sucrose-phosphate Synthase |
| FI | Fouling Index |
| WQI | Water Quality Index |