Keraia - AbsoluteAstronomy.com

Keraia may refer to either of the following diacritic marks:

Keraia (a diacritic in the Greek numeral system)
Tittle
Tittle
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...

(originally appearing in Latin manuscripts in the 11th century)

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