Marc Chaikin invented the Chaikin Accumulation/Distribution oscillator. It is an indicator of an indicator since it uses the Accumulation/Distribution line in the calculation.

It is a momentum indicator that adds volume to its analysis. As many traders say, price follows volume, and this indicator is used to analyze the current momentum of the price to predict future price movements.

The Chaikin A/D Oscillator fluctuates around the value zero. Every time that the indicator crosses goes changes from positive to negative, it suggests that the momentum of the price is changing.

When the indicator crosses the zero line upwards, it means that the price is gaining bullish momentum, and a buy signal is generated. Likewise, when it crosses the zero line downwards, the bearish momentum is taking over, signaling sells.