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If you mean the box that lists the meanings and values of all the various colors, symbols, letters, etc. found on the entirety of the chart, it's called the legend. If you mean, specifically, the line that runs from left to right across the chart, a line used in many but not all types of charts, it's called the abscissa. That term is rarely used, though. It is most often called the x-axis or the category axis.

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14y ago

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