| Acronym | Meaning |
 | PCS | Power Conversion System |
| GFS | Government Furnished Software |
| SBTC | Speed Brake/thrust Controller |
| NSW | NSP Status Word |
| PLISN | Provisioning List Item Sequence Number |
| SSMECA | SSM E Controller Assembly |
| URA | Urine Receptacle Assembly |
| SOW | Sox Supercritical Oxygen |
| CMD | Command |
| FEC | Forward Events Controller |
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