In the usual attributive patronymic between proper names, the initial alif of ibn is also omitted in spelling (بن). This orthographic convention is distinct from removal of tanwīn on the preceding name.
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Written Bin versus Ibn
Tanwīn: Five Types, Their Function, and Omission
In the usual attributive patronymic between proper names, the initial alif of ibn is also omitted in spelling (بن). This orthographic convention is distinct from removal of tanwīn on the preceding name.