| Acronym | Meaning |
| GIPOF | Graded-Index Plastic Optical Fiber |
| PACS | Physics And Astronomy Classification Scheme |
| HELP | Hydrologic Evaluation Of Landfill Performance Model |
| OIRM | Office Of Information Resources Management |
| TIRM | Total Internal Reflection Microscopy |
| APS | Advanced Photon Source |
| VAH | Volatile Aromatic Hydrocarbon(s) |
| RSSC-CPA | Real-space-scattering Cluster Coherent Potential Approxn. |
| USABC | United States Advanced Battery Consortium |
| WLE | Wigner-Liouville Equation (in Study Of Quantum Dynamics) |