Head and Shoulders
In technical analysis, a chart formation that resembles a human head and shoulders and is generally considered to be predictive of a price reversal. A head and shoulders top (which is considered predictive of a price decline) consists of a high price, a decline to a support level, a rally to a higher price than the previous high price, a second decline to the support level, and a weaker rally to about the level of the first high price. The reverse (upside-down) formation is called a head and shoulders bottom (which is considered predictive of a price rally).
Source: Commodity Futures Trading Commission