| Acronym | Meaning |
 | PQGS | Propellant Quantity Gaging System |
| MTEM | Mechanical Maintenance Test Equipment |
| RJD | Reaction Jet Driver |
| UNBAL | Unbalance |
| QRE | Quick-Reaction Estimate |
| PIIN | Procurement Instrument Identification Number |
| GEOSEPS | Geosynchronous Solar Electric Propulsion Stage |
| SPP | Solar Physics Payload |
| SPF | Spacelab Processing Facility |
| VS | Versus |
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