Gaps: Gap is the space between the closing price of the previous day and the opening price of the current day. It can be either up or down and represent a mark-up or mark-down of a share price when the market opens.
Following is a situation of Gap up and Gap Down
Dead Cat Bounce (DCB): Dead cat Bounce is a situation when the chart shows a prevailing trend downwards followed by a small rally, but the direction turns downward again. The second sell-off is then sustained, and resumes the original downtrend. It is also known as a “sucker rally.”
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