This character is a Other Letter and is mainly used in the Arabic script.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it is written as Arabic letter from right to left. When changing direction it is not mirrored. The word that U+067B forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with 12 other glyphs.
The Wikipedia has the following information about this codepoint:
B̤ē (Sindhi: ٻ) is an additional letter of the Arabic script, derived from bāʼ (Arabic: ب) with an additional dot. It is not used in the Arabic alphabet itself, but is used to represent the sound [ɓ] when writing Hausa, Saraiki, and Sindhi in the Arabic script. The same sound may also be written simply as bāʾ in Hausa, undifferentiated from [b].
Both Hausa and Sindhi are also written in scripts besides Arabic. The sound represented by b̤ē is written Ɓ ɓ in Hausa's Latin orthography, and written ॿ in Saraiki and Sindhi's Devanagari orthography.