| Acronym | Meaning |
| PAFC | Phosphoric Acid Fuel Cells |
| IEM | Immunoelectron Microscopy |
| MIONP | Microwave Induced Optical Nuclear Polarization |
| MCRT | Mean Cell Residence Time |
| AQPS | Air Quality Prediction System |
| QUAX | Quantitative Phase-Analysis With X-ray Powder Diffraction |
| PAIR | Patent Application Information Retrieval System |
| GRAS | Generally Recognized As Safe |
| ASSP | Aerosol Scattering Spectrometer Probe |
| CTPGF | Closed Time Path Green Function (in Many-body Theory) |