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ظ ḏ̣/b ब ? Ẓāʾ or ḏ̣āʾ
ض ḍ/b ?
ط b/ṭ

The arabic letters ظ /ض have the strange property of being transcribed as ḏ̣/ḍ but often being pronounced as "b" or "bd"

𓊕 vs 𓈇 tawi town ضواحي ḍawahi (suburbs) ظوحي bawahi beith (house/town) ضَاحِيَة ḍāḥiya

مُتَوَسِّط mutawassiṭ is pronounced mutawassiybṭ in Duolingo

It may be related to the letter beta 𓃀𓏏 and the bi/di devide (both prefixes mean 2-)