| Acronym | Meaning |
| TBM | Tight Binding Model |
| ESEM | Electron Spin Echo Modulation |
| TTSS | Type III Secretion System |
| SBUV | Solar Backscatter UV Instrument |
| SAB | Science Advisory Board (USEPA) |
| CAMM | Cumulative Atomic Multipole Moment (for Mol. Charge Distributions) |
| TMJ | Temporomandibular Joint |
| HNPCC | Hereditary Nonpolyposis Colorectal Carcinoma |
| LCAO LDA | LCAO-local Density Approxn. |
| EOSDIS | Earth Observing System Data Information System |