What happens if I add another triangle, turn it around and put it back to back with the upper one? You get (a sloppy) diamond pattern.
The diamond pattern is a rally to a new high and weakness to an intermediate support level, a second rally to a higher high and a sharp decline through support, followed by a modest third rally and a decline through longer-term trend. Because diamonds are very large patterns, the technical implications are often extremely large.
The diamond formation reversal pattern is found relatively infrequently. When it does form, however, it usually does so at market tops rather than at bottoms. This is consistent with its appearance, which suggests a confused, active market found at a top more often than at a bottom. As the figure shows, the diamond starts off as a broadening formation and then consolidates, usually forming a symmetrical triangle. The combination of price patterns first broadening and then consolidating gives the geometry for which the diamond is named. This shape becomes more apparent when trendlines, like those shown, are drawn connecting successive peaks and valleys. The shape has also been described as a complex head and shoulders with an odd center movement.