It can be. However, if there is a category axis, it is usually the horizontal axis.
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The horizontal axis is also known as the 'X' axis. The vertical axis is also known as the 'Y' axis.
The x axis
It is also known as the x-axis.
---Manipulated, which is also called the independentvariable.
First value: abscissa, is the distance from the origin along the horizontal axis (usually the x-axis). Second value: ordinate, is the distance from the origin along the vertical axis (usually the y-axis).