letters

What is the dot above a letter i called

[hobbes]

According to Oxford:- 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.

[Tdol]

It can also be called a 'tittle', though this includes other small marks in writing like accents.