it is the y-axis
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The y axis is the vertical axis and a y coordinate is the 'ordinate' The x axis is the horizontal and a x coordinate is the 'abscissa'
the horizontal axis is known as the x axis
ordinate
If the co-ordinate you are talking about is in the form of (X,Y) X is the term on the x axis (Bottom axis) Y is the term on the y axis (The Vertical axis) the total co-ordinate will be where the unit on each axis cross.
The ordinate axis, often designated as Y axis The horizontakl axis is the abcissa axis, often designated as X axis