| Acronym | Meaning |
| ICPAC | International Committee On Polycyclic Aromatic Compounds |
| TSDIA | Two-scale Direct-interaction Approximation [in Flow Energy Modeling] |
| INN | International Nonproprietary Names (for Drugs) |
| BLT | Bismuth Lanthanum Titanate |
| ROS | Restricted (or Roothaan) Open-shell (Hamiltonian) |
| NRRA | Nuclear Resonant Reaction Analysis |
| MIAM | Modified Independent-atom Model (for Electron-mol. Scattering) |
| CONDO | Crystal Orbital Neglect Of Differential Overlap |
| TSM | Total Suspended Material |
| INEEL | Idaho National Engineering And Environmental Laboratory |