Momentum Indicator, using a divergence line
The KDJ indicator is actually a derived form of the Stochastic with the only difference being an extra line called the J line.
The J line represents the divergence of the %D value from the %K. The value of J can go beyond [0, 100] for %K and %D lines on the chart.
A negative value of J combined with %K and %D at the bottom range indicates a strong over sold signal.
Likewise, when the J value goes above 100, combined with %K and %D at the top range, it will indicate a strong over bought signal.
Sharechart Default: 14 period, 3 period, 1 period
To change settings, go to Settings>Indicators>KDJ. The chart above had the following settings: