A pattern that occurs during high volatility, when a security shows great movement with little direction. The formation is identified by a series of higher pivot highs and lower pivot lows. A trendline drawn over the pivot highs and under the pivot lows frames out the widening pattern. It looks like a megaphone and, in fact, it is also known by that name. As the two trendlines diverge from the apex, the pattern resembles a reverse version of a symmetrical triangle. This pattern is considered quite rare, but is useful in helping technicians to identify swing trades, rather than a trend trades.