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CandleStick — a type of interval diagrams used mainly to describe changes in stock shares quotations, raw materials prices etc
«CandleStick» diagram is also called a combination of interval and linear diagrams for each segment shows price change range for a certain period of time. Most frequently used in technical analysis of the market.
«CandleStick» consists of the body (black or ) and a wick (upper or lower). Upper and lower bounds of the wick describe the maximum and minimum of the price in trading process respectively, and the bounds of the body describe opening and closing prices.
If the quotations went up, the CandleStick’s body is white, body’s lower bound indicates the opening price, and the upper bound indicates a closing price. If the quotations went down, the CandleStick’s body is black, the body’s upper bound indicates an opening price, and the lower bound indicates a closing price. As soon as the highest and the lowest prices break the opening/closing borders the CandleSticks cast long «shadows».
It means the «price spread» grew too big, it is worth attention.
 
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