A symmetrical triangle is a chart pattern characterized by two converging trend lines connecting a series of sequential peaks and troughs. These trend lines should be converging at a roughly equal slope, with one sloping down and the bottom line sloping up.
The lower line of the triangle, or lower trendline, can be thought of as the demand line, which represents support on the chart. At this point, the buyers of the issue outpace the sellers, and the stock's price begins to rise. The top line is resistance until price breaks the upper trendline.
Throwbacks do happen frequently, and sometimes a symmetrical triangle will break to the downside, before turning around only to break the top trendline.
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