Gulf Arabic
is transliterated as "ḍ" (D with underdot) in romanization. The combination ⟨dh⟩ is also sometimes used colloquially. In varieties where the Ḍād has merged with the Ẓāʾ, the symbol for the latter might be used for both (eg. ⟨⟩ 'to stay' and ⟨⟩ 'to be lost' may both be transcribed as in Gulf Arabic).