A tittle or superscript dot is a small distinguishing mark, such as a diacritic or the dot on a lowercase i or j. The tittle is an integral part of the glyph of i and j, but diacritic dots can appear over other letters in various languages. In most languages, the tittle of i or j is omitted when a diacritic is placed in the tittle's usual position (as i or j), but not when the diacritic appears elsewhere (as i, ).

What is the dot on top of an i called? OK. Let's think. My stream of consciousness:
To answer the question, consider the following: A tittle or superscript dot is a small distinguishing mark, such as a diacritic or the dot on a lowercase i or j. The answer is A tittle or superscript.