| Acronym | Meaning |
| RCS | Reaction Control System |
| PMN | Polymorphonuclear Leukocyte |
| BSO | Basic Symmetric Operator (in Second-quantization Calculations) |
| DMICS | Design Methods For Integrated Control Systems [propulsion] |
| TFB | Thin Film Balance |
| DBI | Diazepam Binding Inhibitor |
| DERP | Defense Environmental Restoration Program |
| DAIP | Diallyl Isophthalate |
| LRTI | Lower Respiratory Tract Infection |
| EERL | Eastern Environmental Research Laboratory |