| Acronym | Meaning |
| RPO | Resonant Periodic Orbit (on Potential Energy Surface In At. Or Mol. Scattering) |
| CPFD | Coupled-pair Functional With Double Excitation |
| SSCP | Static Screened Coulomb Potential |
| VMT | Vehicle Miles Traveled |
| RDS | Reflectance-difference Spectroscopy |
| FEED | Field Emission Energy Distribution |
| MEBS | Medium Energy Backscattering Spectrometry |
| THGF | Trigonometric Hermite Gaussian Function |
| HMM | Hidden Markov Model |
| SAM1 | Semi-ab Initio Model1 |