| Acronym | Meaning |
| MHW MO | Mulliken-Helmholz-Wolfsberg Molecular Orbital |
| TPO | Thermoplastic Polyolefin |
| AHRQ | Agency For Healthcare Research And Quality |
| IGOSS | Integrated Global Ocean Services System |
| SPINOE | Spin Polarization-induced Nuclear Overhauser Effect |
| OTIS | Oklahoma Telecommunications Interlibrary System |
| ABR | Anaerobic Baffled Reactor (for Wastewater Treatment) |
| CCRM | Coupled-channel Reactance Matrix (in Atom Surface Scattering) |
| POAV | Pi Orbital Axis Vector Analysis (electronic-structure Model) |
| MSA | Mean Spherical Approxn. |