| Acronym | Meaning |
| EBO | Equivalent Bond Orbital |
| STM | Scanning Tunneling Microscopy |
| CDT | Critical Dissolution Time (synthetic Fiber And Polymer Property) |
| WKB | Wentzel-Kramers-Brillouin (phase-shift Formula For Potential Scattering) |
| GO | Gaussian Overlap (approxn. In Mol. Calcns.) |
| PTR | Photothermal Radiometry |
| CNO | Constrained Nonorthogonal Orbital (algorithm) |
| EQS | Environmental Quality Standard |
| DRO | Diesel-range Organics |
| PFPE | Perfluorinated Polyether |