Symmetrical triangle is also known as equilateral triangle. Generally speaking, symmetrical triangle belongs to the consolidation form, that is, the price will continue to move along the original trend. It is composed of a series of price changes, and the range of change is gradually reduced, that is, the maximum price of each change is lower than the previous level, and the lowest price is higher than the previous lowest price level, showing a compressed graph. For example, from the horizontal direction, the upper limit is a downward oblique line, and the lower limit is an upward line. By connecting the short-term high points and low points with straight lines, a symmetrical triangle can be formed.
The volume of symmetric triangle decreases due to smaller and smaller price changes, which reflects the long and short forces' hesitant attitude towards the future market. Then, when the foreign exchange trading price suddenly jumps out of the triangle, the trading volume will increase accordingly.
If the price breaks above the resistance line (which must be matched by large volume), it is a short-term buy signal; otherwise, if the price falls below (under low volume), it is a short-term sell signal.