A tittle 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. The tittle of i or j is omitted when a diacritic is placed in the tittle's usual position, but not when the diacritic is elsewhere, and traditionally not in Vietnamese.
OmegaWiki Dictionary
Ω
tittle The little dot above lower case letter ‘i’s and lowercase letter ‘j’s.
