Nothing. They don't stand for anything. The are just the axis on a grid. The x-axis is the horizontle line (from left to right.) and the y-axis is the vertical line (up and down).
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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.
In notation of coordinates it is the x axis followed by the y axis
y=-2.5 is parallel to the x axis. The equation of the x axis is y=0