A macron is a diacritical mark: it is a straight bar placed above a letter, usually a vowel.
A diacritic – also diacritical mark, diacritical point, or diacritical sign – is a glyph added to a letter, or basic glyph.
In phonetics, a vowel is a sound in spoken language, with two competing definitions.
World leaders react to Macron victory by CNN
Its name derives from Greek μακρόν, meaning 'long', since it was originally used to mark long or heavy syllables in Greco-Roman metrics.
A syllable is a unit of organization for a sequence of speech sounds.
Emmanuel Macron's full speech at the Louvre by CNN
It now more often marks a long vowel.
In the International Phonetic Alphabet, the macron is used to indicate a mid-tone; the sign for a long vowel is instead a modified triangular colon ⟨ː⟩.
The International Phonetic Alphabet is an alphabetic system of phonetic notation based primarily on the Latin alphabet.
The opposite is the breve ⟨˘⟩, which marks a short or light syllable or a short vowel.
For other uses, see Micron -.