| Acronym | Meaning |
| IPS | Inclined Plate Settler (for Wastewater Treatment) |
| CSIR | Chemistry Software And Information Resources |
| GBCD | Grain Boundary Character Distribution |
| PDQ | Physician Data Query |
| ENCS | Existing And New Chemical Substances |
| SETB | Semiempirical Tight Binding |
| MCZDO | Many Center Zero Differential Overlap |
| CIEF | Capillary Isoelectric Focusing |
| CIV | Critical Ionization Velocity (ionosphere) |
| DTA | Differential Thermal Analysis |