A macron (/ˈmækrɒn, ˈmeɪ-/) is a diacritical mark, a straight bar ( ¯ ) placed above a letter, usually a vowel. Its name derives from the Greek makrón (μακρόν) meaning "long" and was originally used to mark long or heavy syllables in Greco-Roman metrics. It now more often marks a long vowel.
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