A gap that occurs after the rapid rise in a stock's price begins to tail off. An exhaustion gap usually reflects falling demand for a particular stock.
 
The image shows a gap at the end of a large upward movement, signaling a reversal.

Investopedia Says:
Many technical analysts consider it a temporary gap. The range in prices gapped by the decrease in demand is expected to be filled once demand and the upward pressure on price are re-ignited.

Related Links:
See how you can profit from these disruptions in normal price patterns. Playing The Gap
On their own, single-day patterns can be unreliable, but that doesn't mean they can't be used effectively. Find Turning Points With Single-Day Patterns

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