Williams %R is an oscillator. It is used to identify overbought and oversold. In addition, the indicator helps to determine the direction of the price movement and find the points of its reversal.
Williams %R is optimally suited for the trades in the reversal of the trend. The oscillator can also be used in trading in the direction of price movement. In this case, you need to combine Williams %R with trend indicators to filter out false signals.
The oscillator can be used on any time frame.