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This is an abbreviated name for "Open, High, Low, Close" chart. This is a chart style where each price point mentioned is noted.
The chart above points out some of the basic features of the OHLC charts.
The "up" days (where the close is higher than the open) is the lighter of the two lines and the "down" days are represented with darker lines. The high for the day is the highest point of the line, where the low price of the day is the lowest point of the line. The opening price is represented by the horizontal tick that faces to the left and the closing price is represented by the horizontal tick that faces to the right.