| Acronym | Meaning |
| EXREP | Expeditious Repair (SM&R Code) |
| SOFIA | Stratospheric Observatory For Infrared Astronomy |
| PLM | Polarized Light Microscope/Microscopy |
| DJ | Disc Jockey - Dinner Jacket -Djibouti (ISO 3166 Digram; FIPS 10-4 Country Code) |
| PWC | PieceWise Constant (describing A Mathematical Function) |
| CTO | Chief Technical Officer - Chief Technology Officer |
| HEO | Highly Elliptical Orbit |
| BCT | Brigade Combat Team |
| SCJD | Sporadic Creutzfeldt-Jakob Disease |
| DP | Decision Point - Dynamic Programming |