| Acronym | Meaning |
| SCO | Subcarrier Oscillator |
| PRT | PulseRepetitionTime |
| UL | Underload |
| MTD | Mounted |
| SPI | Surface Position Indicator |
| SDCP | Summary DeveloPment Cost Plan |
| SEO | Special Engineering Order |
| INTERFACE | CInterface Control Drawing |
| SSCSP | Space Shuttle Crew Safety Panel |
| SPP | Simulation Planning Panel |