U+0630 Arabic Letter Thal

The Wikipedia has the following information about this codepoint:

Ḏāl (ذ, also be transcribed as dhāl) is one of the six letters the Arabic alphabet added to the twenty-two inherited from the Phoenician alphabet (the others being ṯāʾ, ḫāʾ, ḍād, ẓāʾ, ġayn). It is also one of the ten letters the Persian alphabet added from the twenty-two inherited from the Phoenician alphabet (the others being s̱e, xe, zâd, ẓâ, ġayn, pe, che, že and gaf). In Modern Standard Arabic it represents /ð/. In name and shape, it is a variant of dāl (د). Its numerical value is 700 (see abjad numerals). The Arabic letter ذ is named ذَالْ ḏāl. It is written in several ways depending in its position in the word:

The South Arabian alphabet retained a symbol for ḏ, .

When representing this sound in transliteration of Arabic into Hebrew, it is written as ד׳‎.

This sound is found in English, as in the words "those" or "then". In English the sound is sometimes rendered "dh" when transliterated from foreign languages, but when it occurs in English words it is one of the pronunciations occurring for the letters "th". Azerbaijan is the only country name in Arabic that uses this letter.