⟨ᶑ ⟩ was added to Unicode with version 4.1 in 2005, but very few fonts display it.
LATIN SMALL LETTER D WITH HOOK AND TAIL
There is no standard Unicode encoding for the capital form. However, SIL fonts such as Gentium Plus, Doulos SIL and Charis SIL have U+F20D in their private-use areas as the capital form of ⟨ᶑ ⟩. Alternatively, combining characters can also represent the uppercase ᶑ (like Ɗ̢).