One possible answer is the y-axis. However, there need not be any y axis.
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The vertical axis of a graph is known as the ordinate and the horizontal axis of a graph is known as the abscissa. So commonly when talking about (x,y) as a point on the graph, we refer to x value as the abscissa and y value as the ordinate.
Its x coordinate is 0.The abscissa (x-coordinate) is zero.
An abscissa is the coordinate representing the position of a point along a line perpendicular to the y-axis in a plane Cartesian coordinate system.
It's somewhere on the y-axis.
The simple answer is "the coordinates". A more pedantic answer is abscissa along the horizontal axis and ordinate on the vertical axis.