| Acronym | Meaning |
| ELS | Earth Landing System (Subsystem) |
| OGA | Outer Gimbal Axis |
| SSO | Source Selection Official |
| DA | Deployed Assembly |
| S&A | Science And Application |
| LOU | Input/Output Unit |
| TMP | Time Management Processor |
| SPRT | Sequential Probability Ratio Test |
| PIGA | Pendulous Integrating Gyro Accelerometer |
| LASV | Low Altitude Supersonic Vehicle |