| Acronym | Meaning |
| IEL | Independent Electron (model In Ion-impact Ionization Calcns.) |
| ECI | Size-extensive CI |
| UEBS | Unitarized Eikonal Born Series (in Electron-atom Scattering) |
| WAN | Wide Area Network |
| HERL/MIS | Health Effects Research Laboratory Management Information System |
| CSCT | US EPA Consortium For Site Characterization Technology |
| EAE | Experimental Allergic Encephalomyelitis |
| LGM | Linearized Green-function Method (for Electronic-structure) |
| IVO | Improved Virtual Orbital |
| ULDPE | Ultra Low Density Polyethylene |