| Abbreviation | Definition |
|---|---|
| QTC | Quantum Tai Chi Gauge Theory |
| QTE | Quantum Transport Equation |
| QTG | Quantum Theory of Gravity |
| QTI | Quantum Theory of Immortality |
| QTM | Quantum Tunneling of Magnetization |
| QTN | Quasi-Thermal Noise |
| QUPLAS | QUantum interferometry with Positrons and LASers |
| QVB | Quasiempirical Valence Bond |
| QVE | Quasi-Vibrational Energy |
| QWH | Quasigroups With Holes |
| QWI | Quantum Well Intermixing |
| QWIP | Quantum Well Infra-Red Photodetector |
| QWW | Quantum Well Wire |
| QZD | Quantum Zero Dynamics |
| QZE | Quantum Zeno Effect |
| QZP | Quantum Zeno Paradox |
| R | Angle of Reflection |
| R | Relative Permeability |
| R | Result |
| R | Roentgen |