| Acronym | Meaning |
| ACL | Alternative Concentration Limit |
| PDB | Protein Data Bank |
| ISCA | Ionization Spectroscopy For Chemical Analysis |
| PSC | Primary Sclerosing Cholangitis |
| CAOS | Computer Assisted Organic Synthesis |
| PEMS | Predictive Emission Monitoring System |
| NSTL | Near Surface Transition Layer |
| IAGA | International Association Of Geomagnetism And Aeronomy |
| LED | Light-emitting Diode |
| TM | Thematic Mapper (Remote Sensing) |