| Acronym | Meaning |
| GLD | Glide Slope |
| PC | Chamber Pressure |
| ESI | Electrical System Integration |
| VDD | Verification Description Document |
| SPA | Steering Position Amplifier |
| SRPA | Spherical Retarding Potential Analyzer |
| PCA | Point Of Closest Approach |
| PM | Pulse Modulation |
| TIO | Target Insertion Orbit |
| TA | Test Article |