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+06AF forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with 6 other glyphs.
The Wikipedia has the following information about this codepoint:
Gaf (Persian: گاف; gāf), is the name of different Perso-Arabic letters, all representing /ɡ/. They are all derived from the letter kāf, with additional diacritics, such as dots and lines. 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, ẕâl, zâd, ẓâ, ġayn, pe, che, and že). In name and shape, it is a variant of kaf. Its numerical value is 5000 (see Abjad numerals). There are four forms, each used in different alphabets:
گ in the Persian alphabet, Tausug written in Arabic Script