A breve (Latin brevis "short, brief") is a diacritical mark ˘, shaped like a little round cup, designed to indicate a short vowel, as opposed to the macron ¯ which indicates long vowels. It is often used this way in dictionaries and textbooks of Latin, old Greek and some other languages, such as Tuareg. (However, there is a frequent convention of indicating only – but all – the long vowels: it is then understood that a vowel with no macron is short.)