Dispersion indicators are indicators which measure the spread of price distribution. Most people tend to use them for mean reversion techniques; a purpose that usually means trying to determine overbought and oversold areas. Many times, this means that such indicators tend to be bounded oscillators. On this site, they may actually be listed in both places.
Most of the indicators listed in the Cycle-Adaptive Indicators page will qualify as Dispersion Indicators.
Here are some other Dispersion Indicators that stand on their own.