In the ordered pair (a, b), the object a is called the first entry, and the object b the second entry of the pair. Alternatively, the objects are called the first and second coordinates, or the left and right projections of the ordered pair.
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This is called an ordered number pair
order pair
Because otherwise it would not be an "ordered" pair.
A pair of numbers developed by Descartes is called a coordinate pair. It is alphabetical and the horizontal axix is listed first.
When the order in which they are given makes no difference.