| Acronym | Meaning |
| HREELS | High-resolution Electron Energy-loss Spectroscopy |
| PRTR | Pollutant Release And Transfer Register |
| NDPD | National Data Processing Division |
| IISCI | Initial Ionic State Comfiguration Interaction |
| MEG4 | Multiexponentially Generated 4 (wave Functions) |
| CITAC | Cooperation On International Traceability And Analytical Chemistry |
| CDRP | Carbon Dioxide Research Program (of US Department Of Energy) |
| QWIP | Quantum Well IR Photodetector |
| TRMM | Tropical Rainfall Measuring Mission |
| RWKB | Relativistic Wentzel-Kramers-Brillouin |