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On-Balance Volume (OBV): Developed by John Granville, OBV provides a running cumulative total of advancing and declining volume. Volumes on up days are added to the figure whereas volumes on down days are subtracted. OBV typically trend in the same direction as the price as is used as a confirmation. When a divergence between the price trend and OBV occurs, it can be an early signal of a potential trend reversal.


Open interest: The number of derivative contracts (options or futures) that are still unmatched at the end of a trading day. It is a measure of liquidity in the derivatives market instead of the typical volume in the equities market.


Oscillators: Technical indicators constructed to provide indications if a market is in an overbought or oversold condition. Examples include RSI, Momentum, Stochastics, etc.


Overbought: A term used to describe when an oscillator has reached the upper extremes where the price becomes vulnerable to a selloff.


Oversold: A term used to describe when an oscillator has reached the lower extremes where it is expected a rebound in the price is due.

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