It is zero at the origin, positive above and negative below. Otherwise it can be numbered to any scale.
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If you're talking about a graph then here's your answer... There are to axis's the x axis (horizontal) and the y axis (vertical). So your talking about the vertical scale so since a graph is shaped like an L the vertical part would contain the scale (numbers along the side) so that you can read a bar graph easier
a scale with diffrent numbers
the thing that you are measuring is usually plotted on the Y axis . the X axis is usually time scale
It will alter the apparent variation in the variable plotted using that axis.