The title, legend ( or key) and axes labels all contribute.
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There are various different ways to graph information, but the part that tells you what the bars or lines represent is called a label. A label might appear next to a line, or a bar, or it might only appear on the x axis and the y axis.
legend
A pie graph represent data as a part of a whole, showing the separate portions of the data in accordance to the whole.
The KEY or LEGEND tells the viewer what the lines represent. The labels along the axes usually tell the viewer what the units are, but the title of the graph can be used to tell the viewer the units as well or instead.
it is the y axis or part of the y axis