- Arabic diacritic similar in appearance to a tilde. Over an alif (آ "alif maddah"), it indicates glottal stop, /ʔ/, followed by a long /aː/. The diacritic is not used separately, only over alif. Alif maddah can appear in the beginning: آسف (ʾāsif) or in the middle of a word: قرآن (qurʾān).
- In the Qur'an, it indicates an extra long vowel and can appear over any long vowel.
- In Persian the letter is used only in the beginning of a word with a long /aː/: آمدن (âmadan)
From Arabic مَدَّةٌ (madda).