Random article: Williams' Percent Range
Williams' Percent Range is a technical indicator of oscillator type showing overbought/oversold status on market. The first time it was described in 1973 by a famous trader Larry Williams. The indicator itself is very close to Stochastic Oscillator, but unlike Stochastic, WPR is not smoothed over with the help of moving average and has a reverse sale in order to not deprive sense of overbought (at the top) and oversold (downwards) zones.