$Q$ is a [[Dimensionless|dimensionless]] property of a [[Damped Harmonic Oscillators|Damped Harmonic System]] that describes its resonance behavior. $\huge \begin{align} Q &= \frac{m\omega_{0}}{b} \\ \frac{1}{Q} &= \frac{\Delta \omega}{\omega_{0}} \end{align} $ A higher $Q$ factor means the system loses energy slower an with oscillate for longer, while a longer $Q$ factor means the system will oscillate less due to energy loss.