The method of poetic dating by calculating sentences is an old method used during the Islamic era in the history of some Islamic establishments by calculating the numerical values of the letters of the alphabet according to specific values. In this study, we will study and analyze the section on dating by calculating sentences in a group of founding inscriptions or tombstones remaining in Dakahlia Governorate, and through them we will examine the methods of dating by calculating sentences and

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... s different methods used in the inscriptions under study.