| Abbreviation | Definition |
|---|---|
| QRE | Quasi Reference Electrode |
| QRR | Reverse Recovery Charge (Q = charge) |
| QRS | Quantronic Resonance System |
| QRS | Quasi-Random Signal |
| QRU | Quad Relay Unit |
| QSOP | Quarter Size Outline Package |
| QSR | Quality System Review |
| QSW | Quasi-Static Wafer |
| QSWL | Quasi-Static Wafer Level |
| QSWLT | Quasi-Static Wafer Level Tester |
| QTA | Quick Turn Around |
| QTO | QT Optoelectronics |
| QTO | Quick Turn Oscillator |
| QUASAR | Quasi-Stellar Radio Source |
| QW | Quantum Well |
| QWIR | Quantum Well, Infra-Red (detector) |
| QWR | Quantum Wire |
| QXO | Quartz Crystal Oscillator |
| QZU | Quad Zone Unit |
| R | Redundant |