| Acronym | Meaning |
 | SEM | Scanning Electron Microscope |
| SP-AF | Air Force Support Office (KSC) |
| CL | Centerline |
| SMPTRB | Shuttle Main Propulsion Test Requirement Board |
| IVAR | Internal Variable |
| PRR | Program Requirements Review |
| SRDH | System Requirements Definition Handbook |
| PB | Pushbutton |
| S/0 | Shutoff |
| NOAA | National Oceanic And Atmospheric Administration |
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