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Letter

 * 1) ḍamma tanwīn (ضَمَّة تَنْوِين) or ḍammatān (ضَمَّتَان), a nunation (tanwīn (تَنْوِين)) of the vowel u (ـُ - ḍamma), indicating the nominative case in Classical Arabic. In a non-pausal formal situation it's pronounced as "-un". In dialects, relaxed (less formal) Arabic or in pausa, the pronunciation is either shorted to "-u" or ignored altogether, even when written.