When you are changing a scale on a graphic, you warn the viewer by using a squiggle line on the changed axis. If the bar is unusually long, the bar length is compressed with a squiggle in the bar itself.
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An answer can be found here:
It is the axis of symmetry.
The x axis is usually the horizontal number line on a bar graph.
It is simply a horizontal line. No special name, unless you're referring to the axis/axes. The horizontal line is the 'x-axis' in a graph.
It could be a velocity graph or an acceleration graph. If the plot is a straight line it is constant velocity. If the plot is a curve it is acceleration.