| Acronym | Meaning |
| STLE | Society Of Tribologists And Lubrication Engineers |
| LTH | Linearized Time-dependent Hartree (approxn. |
| PIRR | Polarized IR Reflection |
| DCS | Distributed Control System |
| POA | Peierls-Onsager Approxn. (in Electronic Structure Calcns.) |
| VNTR | Variable No. Of Tandem Repeat |
| MMR | Mismatch Repair |
| WENDB | Water Enforcement National Data Base |
| DISI | Direct-injection Spark-ignition |
| CASRN | Chemical Abstracts Service Registry Number |