| Acronym | Meaning |
 | IDG | Integrated Drive Generator |
| DARS | Data Acquisition And Reduction System |
| LBNPD | Lower Body Negative Pressure Device |
| IOB | InPut/Output Buffer (if Bus |
| RFL | Reflect |
| PCCP | Preliminary Contract Change ProPosal |
| LID | Logistics Identification Document |
| DDPS | Digital Data Processing System |
| PSS | Payload Specialist Station |
| PAU | Probe Aerodynamic Upper |
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