| Acronym | Meaning |
| ILS | Intracavity Laser Spectroscopy |
| IEL | Intraepithelial Lymphocyte |
| OPAL | Omni-Purpose Apparatus At LEP |
| FAD | Failure Assessment Diagram |
| HSC | High Conversion Soaker (cracking) [petroleum Viscosity-breaking] |
| VCSEL | Vertical Cavity Surface Emitting Laser |
| DIM-3C | Diatomics-in-mols. Method Including 3-center Terms (integrals) |
| USN | Ultrasonic Nebulizer |
| FRDS | Federal Reporting Data System |
| JAICI | Japan Association For International Chemical Information |