Dad ض

Dad is the fifteenth letter of the modern Arabic order, written as the sad skeleton with a single dot above: a long flat loop running into a shallow bowl that drops below the line. It joins on both sides and keeps the loop alone at the beginning and in the middle of a word. It is one of the four emphatic consonants, made with the back of the tongue raised toward the soft palate, and the emphasis colours the vowels on either side of it. It is a sun letter, so the lam of the definite article assimilates to it in speech.

Like tha, kha, dhal, za and ghayn, dad is one of the six letters Arabic added to the twenty-two letter sequence it inherited, and its position records that. In the modern order, arranged by shape, it stands beside the sad it is built from. In the older abjad order it is among the six appended after the inherited letters, where it carries the numeral value eight hundred. It has no Northwest Semitic name behind it and no cognate letter in Hebrew, Syriac or Samaritan whose name may be set beside it.

No letter carries more identity than this one. Arabic is called the language of dad, and Arabic speakers are called the people of dad, on the understanding that the sound is unusual among the languages of the world and that mastering it marks a speaker. The phrase is old, it is still current, and it is used as often in cultural argument as in linguistic description.

The claim that dad is unique to Arabic rests on what the letter sounds like, and what it sounded like when the claim was first made is not the same as what it sounds like now. In modern standard pronunciation dad is an emphatic d, articulated like dal with the back of the tongue raised. That is not the sound the early grammarians describe.

Sibawayh, the eighth century grammarian whose account of Arabic phonetics is the earliest systematic one to survive, places dad at the side of the tongue against the molars and describes an articulation that later readers have taken to mean a lateral sound, something closer to a sideways emphatic l than to a d. Several lines of evidence have been brought to bear: the descriptions in the grammatical tradition, the way Arabic words containing dad were borrowed into Spanish, Persian, Turkish, Malay and Hausa, the pronunciation preserved in some peripheral dialects of southern Arabia, and the treatment of the letter in the recitation manuals. They do not all point the same way, and reconstructions of the original value differ.

This is a genuine scholarly disagreement rather than a gap: the evidence is public, several reconstructions have been argued at length, and specialists still hold different positions. The atlas records that the disagreement exists and does not choose between the readings. What is not in dispute is that the sound changed, that the change happened early enough for the recitation tradition to have carried the older value for a time, and that the identity claim attached to the letter outlived the sound that prompted it.