It could either be a graph with 3 horizontal axes;
or
a graph with one horizontal axis and two vertical ones. This would be for situations where you wish to plot several dependent variables against the same independent one, but the units or scale of the independent variables do not allow you to use the same axis. For example, you may wish to plot the rate of inflation (%) and numbers unemployed (millions) in an economy against the same independent variable, time;
or
it could be a three dimensional graph. And, by that is meant a genuine 3-d graph with 3 interacting variables rather than a graph that has been given a spurious (and sometimes misleading) third dimension.
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The graph is called a corrdinate plane. The horizontal is called the x-axis. The verticle is the y-axis.
x axis
distance-time graph
Origin.
X axis is horizontal, and The Y axis is vertical.