alif carrying the waṣla sign (ٱ) indicates liaison with the preceding word and means that the hamza is suppressed. It is more commonly indicated by a regular alif without a hamza (ا). It occurs, for example, in the definite article ٱل (l-), ٱسْم (sm-), ٱبْن (bn-), imperative verbs, and the perfective aspect of verb forms VII to X, but is not pronounced following a vowel: (e.g., البيت ٱلكبير is read al-baytu l-kabīru). It occurs only at the beginning of a word that is not initial in a word group, or the beginning of a word following a prefixed preposition or conjunction.
هُوَ ٱبْنُ ٱلمُدَرِّسِ (huwa bnu l-mudarrisi, “He is the teacher’s son.”)
وَٱسْمُ ٱلبِنْتِ أَنْهَارٌ (wa-smu l-binti ʾanhārun, “And the girl’s name is Anhar.”)