A Breve

(orthography, printing) A semicircular diacritical mark (˘) placed above a vowel, commonly used to mark its quantity as short.

Synonym: micron

Antonym: macron

(music) A double whole note.
(law) Any writ or precept under seal, issued out of any court.
(zoology) The great ant thrush of Sumatra (Pitta gigas), which has a very short tail.