| Acronym | Meaning |
| APF | Advanced Particle Filter |
| RITD | Resonant Interband Tunneling Diode |
| FCM | Finite-cluster Model (for Calcns. On Electromigration) |
| NNDO | Neglect Of Nonbonded Differential Overlap |
| SIAM | Single-impurity Anderson Model |
| NAICS | North American Industrial Classification System |
| MESP | Molecular Electrostatic Potential |
| CRIB | Computerized Resources Information Bank |
| EEF GTO | Electric Field Gradient Gaussian-type Orbital |
| RCNDO | Rydberg CNDO |