| Acronym | Meaning |
| ATM | Asynchronous Transfer Mode |
| SSB | Semiclassical Sudden Born (approxn. In Ion-atom Collisions) |
| EBRT | Empty-bed Residence Time |
| HALT | Hydrate Addition At Low Temperature (for Sulfur Dioxide Removal From Flue Gases) |
| FOMBT | First-order Many-body Theory |
| ICC | Ignition Control Compound |
| TMB | Table Mesa Basalt (USGS Rock Standard) |
| PPD | Purified Protein Derivative |
| NRIOSA | Nonreactive Infinite-order Sudden Approxn. |
| CPC | Compound Parabolic Concentrator (for Solar Collectors And Solar Cells) |