Q
| Acronym | Meaning |
| QA | Quality Assurance |
| QAE | Quality Assurance Engineer |
| QL | Quicklook - Telemetry that is used to monitor health and safety of the spacecraft and instruments. |
R
| Acronym | Meaning |
| R/T | real-time |
| R-S | Reed-Solomon |
| RAAN | Right Ascension of the Ascending Node |
| RDL | Record Definition Language |
| RE | Earth Radius |
| RF | Radio Frequency |
| RIFCA | Redundant Inertial Flight Control Assembly |
| RPI | Radio Plasma Imaging Radio Plasma Imager |
| rpm | revolutions per minute |
| RTS | Relative Time Sequence |
| RW | Reaction Wheel |
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