There's no such thing.
A set of x, y, and z axes (the plural of axis) make up a cartesian coordinate system in 3-dimensional space, though.
Check related link if you would like to see an example of x y z axis
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The x axis comes first! The Y axis is second!Remember: X,Y,Z!
It intersects the x-y plane along the y-axis, and is at 45° angle to the x-y plane. If you rotate the axes so that x is horizontal, z is vertical, and y is pointing away from you, it will look like the line y = x in the xy coordinate system. See below z | | | |45°angle |/ y----------------x (y-axis is pointing away from you)
The x-axis comes first. because x comes before y.
The x-axis is the horizontal axis on a graph. The y-axis is the vertical axis on a graph.
In a Cartesian grid, the x-axis is the horizontal axis, and the y-axis is the vertical axis.