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Voiced retroflex implosive
Voiced retroflex implosive ᶑ Encoding Entity (decimal)
Unicode (hex) U+1D91
voiced is a type of retroflex implosive consonantal sound. It has not been confirmed to be phonemically distinct from alveolar / in any language, though the claim has been made for ɗ/ Ngad'a, an Austronesian language of Flores.  Sindhi has an implosive that varies between dental and retroflex articulation, while Oromo and Saraiki have /ᶑ/ but not /ɗ/.
The symbol for this,
⟨ (a D with a tail for retroflex and a hook-top for implosive), is not officially recognized by the ⟩ ᶑ IPA, but is supported in the Unicode Phonetic Extensions Supplement.
Features of the voiced retroflex implosive:
manner of articulation is occlusive, which means it is produced by obstructing airflow in the vocal tract. Since the consonant is also oral, with no nasal outlet, the airflow is blocked entirely, and the consonant is a stop. Its
place of articulation is retroflex, which prototypically means it is articulated subapical (with the tip of the tongue curled up), but more generally, it means that it is postalveolar without being palatalized. That is, besides the prototypical subapical articulation, the tongue contact can be apical (pointed) or laminal (flat). Its
phonation is voiced, which means the vocal cords vibrate during the articulation. It is an
oral consonant, which means air is allowed to escape through the mouth only. It is a
central consonant, which means it is produced by directing the airstream along the center of the tongue, rather than to the sides. The airstream mechanism is implosive (glottalic ingressive), which means it is produced by pulling air in by pumping the glottis downward. Since it is voiced, the glottis is not completely closed, but allows a pulmonic airstream to escape through it.
either apical or subapical, place of articulation is more forward than for the retroflex stops, does not contrast with a dental implosive
^ Djawanai, Stephanus. (1977). A description of the basic phonology of Nga'da and the treatment of borrowings.
NUSA linguistic studies in Indonesian and languages in Indonesia, 5, 10-18.
Shackle, Christopher (1976). The Siraiki language of central Pakistan : a reference grammar. London: School of Oriental and African Studies. pp. 22–23.