| Abbreviation | Definition |
|---|---|
| QT | Quasi Transverse |
| QT | Queue Threshold |
| QTL | Quality Trait Locus |
| QTL | Quantative Trait Loci |
| QTL | Quantitative Trait Loci |
| QTL | Quantitative Trait Locus |
| QTM | Quantitative Techniques in Management |
| QU | Quantitative Uncertainty |
| QUEST | Quick Unbiased Efficient Statistical Tree |
| QV | Qualitative Value |
| QVD | Quadratic Variation Diminishing |
| QVR | QUANTITY VARIANCES Function |
| QWS | Qualitative Weight and Sum |
| QXE | Queue Execution Equation |
| QXY | Phase Angle Shift |
| R | Radius |
| R | Random |
| R | Ratio |
| R | Rationality |
| R | Real |