The Wedge Formation is also similar to a symmetrical triangle in appearance, in that they have converging trend lines that come together at an apex. However, wedges are distinguished by a noticeable slant, either to the upside or to the downside. As with triangles, volume should diminish during its formation and increase on its resolve. The Following is a Typical Wedge Formation Trend Pattern
A falling wedge is generally considered bullish and is usually found in up-trends. But it can also be found in downtrends as well. The implication however is still generally bullish. This pattern is marked by a series of lower tops and lower bottoms.
A rising wedge is generally considered bearish and is usually found in downtrends. They can be found in up trends too, but would still generally be regarded as bearish. Rising wedges put in a series of higher tops and higher bottoms.
HERE IS A SAMPLE CHART WITH A PARABOLIC FORMATION