| Acronym | Meaning |
| EPA | United States Environmental Protection Agency |
| ALU | Arithmetic Logic Unit |
| HMIX | Hazardous Materials Information Exchange |
| HASP | Harmonically Analyzed Sensitivity Profile |
| GIST | Gastrointestinal Stromal Tumor |
| HESSI | High Energy Solar Spectroscopic Imager |
| ECHO | European Community Host Organization |
| MRD-CI | Multireference Double-excitation Configuration Interaction |
| JEIDA | Japan Electronic Industry Development Association |
| SCM | Self-consistent Multipolar (method In Metal Cluster Calcns.) |