William's %R

Williams Percent Range (%R) determines whether the market is overbought/oversold. Williams %R is very similar to the Stochastic Oscillator. The only difference is that %R has an upside down scale and the Stochastic Oscillator has internal smoothing. In the chart below you can see that the plots are identical but they are plotted on different scales.

Read more about Williams %R on Investopedia