The tiny dot above lowercase ‘i’ and ‘j’ is called a tittle.

Wacky WorldLanguage

The small diacritic mark situated above the lowercase letters “i” and “j” in the Latin alphabet is formally named a “tittle” (derived from the Latin titulus, meaning inscription or heading). It originated in medieval European monasteries during the 11th century to distinguish the single vertical stroke (“minim”) of lowercase i from neighboring strokes in letters like u, m, and n, which looked virtually indistinguishable in compact Gothic blackletter script.

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