Which word is used to refer to the dot above the lowercase letters "i" and "j"?

The simple dot over the letters "i" and "j" is called the tittle. It is used every day when people write words on paper. Generally referred to as a diacritic dot, the tittle is only seen over the letters "i" or "j" in the English alphabet.

It has been said that the tittle originally appeared in Latin manuscripts as a way of individualizing the neighboring letters i and j. It helped to make handwriting certain words easier to discern. While a diacritic dot is usually referred to as a glyph, most people are able to recognize the letters j and i without the dot. The tittle is a mark that clearly helps each of the two letters to stand independently or unaccompanied.