Question

What's the name of the dot above the letters i and j?

Answer 1

I and j represent a direction which is x and y axis

Answer 2

Hey mate here is your answer:-

The dot is just called Superscript Dot. It was added to the letter i in the Middle Ages to distinguish the letter (in manuscripts) from adjacent vertical strokes in such letters as u, m and n. J is a variant form of i which emerged at this time and subsequently became a separate letter.  

Hope this helps you...........

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