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An overline, that is, a single line above a chunk of text, should not be confused with the macron, a diacritical mark placed above (or sometimes below) individual letters. The macron is narrower than the character box.
Ā, lowercase ā ("A with macron"), is a grapheme, a Latin A with a macron, used in several orthographies.Ā is used to denote a long A.Examples are the Baltic languages (e.g. Latvian), Polynesian languages, including Māori and Moriori, some romanizations of Japanese, Persian, Pashto, Assyrian Neo-Aramaic (which represents a long A sound) and Arabic, and some Latin texts (especially for ...
A macron (/ ˈ m æ k r ɒ n, ˈ m eɪ-/ MAK-ron, MAY-) is a diacritical mark: it is a straight bar ¯ placed above a letter, usually a vowel.Its name derives from Ancient Greek μακρόν (makrón) 'long' because it was originally used to mark long or heavy syllables in Greco-Roman metrics.
A diacritic (also diacritical mark, diacritical point, diacritical sign, or accent) is a glyph added to a letter or to a basic glyph. The term derives from the Ancient Greek διακριτικός (diakritikós, "distinguishing"), from διακρίνω (diakrínō, "to distinguish").
A vinculum (from Latin vinculum ' fetter, chain, tie ') is a horizontal line used in mathematical notation for various purposes. It may be placed as an overline or underline above or below a mathematical expression to group the expression's elements.
Language scripts or transcription schemes that use the dot above a letter as a diacritical mark: In some forms of Arabic romanization, ġ stands for ghayn (غ).; The Latin orthography for Chechen includes ċ, ç̇, ġ, q̇ and ẋ, corresponding to Cyrillic цӏ, чӏ, гӏ, къ and хь and representing /tsʼ/, /t͡ʃʼ/, /ɣ/, /qʼ/ and /ħ/ respectively.
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Coptic numerals are an alphabetic numeral system in which numbers are indicated with letters of the alphabet, such as ⲫ for 500. [10] The numerical value of the letters is based on Greek numerals. Sometimes numerical use is distinguished from text with a continuous overline above the letters, as with Greek and Cyrillic numerals.