Usually you will be provided a table or terrain index reference points. For example with a table you will exchange the number in the grid with the letter that is above that number in the table.
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ordered pair
In the form of (x, y) whereas x always precedes y on the coordinated grid.
These are called coordinates.
It is the Cartesian plane whereas the x and y coordinates are plotted on it.
Points on a grid? It would then be x,y and z coordinates