| Acronym | Meaning |
 | PT2D | Second-order Perturbation Theory (with) Diagonal (part Of Fock Matrix) |
| RIOS | Reactive Infinite-order Sudden (at.-mol. Reactive Collisions) |
| PSC | Polar Stratospheric Clouds (in Antarctic) |
| APD | Antiphase Domain |
| DIMZO | Diatomics-in-molecules Zero-overlap |
| HNFETB | Hybridization Of Nearly Free Elctrons With Tightly Bound States (for Band-structure Calcns.) |
| HCL | Hollow Cathode Lamp |
| DLTFS | Deep Level Transient Fourier Spectroscopy |
| PEMFC | Polymer Electrolyte Membrane Fuel Cell |
| APA | Air Pathway Analysis |
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