Category axis.
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Which point is not located on the xaxis or the yaxis of a coordinate grid?Read more:Which_point_is_not_located_on_the_xaxis_or_the_yaxis_of_a_coordinate_grid
It is called the ordinate.
.... then your graph is inverted.
There is no PowerPoint control center in Excel. MS PowerPoint is a presentation application. MS Excel is a spreadsheet.
The "x-axis" usually refers to the horizontal axis. In Excel, that would be relevant for graphs created with Excel.