U+FEBF Arabic Letter Dad Initial Form

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Ḍād (ﺽ) is one of the six letters the Arabic alphabet added to the twenty-two inherited from the Phoenician alphabet (the others being ṯāʾ, ḫāʾ, ḏāl, ẓāʾ, ġayn). It is also one of the ten letters the Persian alphabet added from the twenty-two inherited from the Phoenician alphabet (the others being s̱e, xe, ẕâl, ẓâ, ġayn, pe, che, že and gaf). In name and shape, it is a variant of ṣād. Its numerical value is 800 (see Abjad numerals).

In Modern Standard Arabic and many dialects, it represents an "emphatic" /d/, and it might be pronounced as a pharyngealized voiced alveolar stop , pharyngealized voiced dental stop [d̪ˤ] or velarized voiced dental stop [d̪ˠ]. The sound it represented at the time of the introduction of the Arabic alphabet is somewhat uncertain (most likely around late seventh to early eighth centuries), likely a pharyngealized voiced alveolar lateral fricative or a similar affricated sound [d͡ɮˤ] or [dˡˤ]. One of the important aspects in some Tihama dialects is the preservation of the emphatic lateral fricative sound [ɮˤ], this sound is likely to be very similar to the original realization of ḍād, but this sound ([ɮˤ]) and [ðˤ] are used as two allophones for the two sounds ḍād ض and ẓāʾ ظ.