Madd refers to the long-vowel combination in which a weak letter is quiescent and is preceded by the matching short vowel: fatḥah before alif, ḍammah before wāw, or kasrah before yāʾ.
Word / formMeaning / explanation
قَالَthe long ā is represented with alif.
يَقُولُa long ū follows ḍammah and is represented by wāw.
يَبِيعُa long ī follows kasrah and is represented by yāʾ.
These sound correspondences prepare the learner for later weak-letter changes, but they must not be mistaken for a separate radical in every visible form.