| Acronym | Meaning |
| VIRTIS | Visual IR Spectral And Thermal Spectrometer |
| EFB | Empty Fruit Bunch |
| RSM | Reactive Scavenging Module |
| RR | Round Robin (test) |
| HDL | High Density Lipoprotein |
| DIIS | Direct Inversion In The Iterative Space |
| PI | Pollution Index |
| FIPS | Federal Information Processing Standard |
| USAN | US Adopted Names (for Drugs) |
| SCC | Source Classification Code |