Stochastics
Stochastic studies, or oscillators, help monitor a trend's sustainability and signal reversals in prices. Stochastics come in two types, %K and %D, measured on a scale from 0 to 100. %K is the "fast", more sensitive indicator, while %D is "slow" and takes more time to turn.
Stochastic studies aren't useful in choppy, sideways markets. In these conditions %K and %D lines might cross too frequently to signal anything.