A semicircular diacritical mark placed above a vowel, with the bowl of the mark opening upward
An accent mark placed above a character originally used to indicate a short vowel (opposite of a macron (qv)) It is used in languages such as Esperanto, Navaho, Rumanian, modern Turkish, Vietnamese and many transliterated (qv) languages (cf accents)
It was formerly of a square figure (as thus: &?; ), but is now made oval, with a line perpendicular to the staff on each of its sides; formerly much used for choir service