This character is a Other Letter and is mainly used in the Arabic script. The character is also known as kaf mashkula.
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+06A9 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
Khē or Keheh, is a letter of Arabic script, used to write /kʰ/ in Sindhi. It is equivalent to क in Sindhi's Devanagari orthography.
In Arabic, it is considered a variant form of kāf, notably al-kāf al-mashkūlah or al-kāf al-mashqūqah. It is the predominant form of kāf in the Perso-Arabic script.
But in Sindhi, khē and kāf are differentiated: khē (ک) is used consistently for /kʰ/, and kāf (ڪ) for /k/. This is similar to the history of I and J, and of U and V, in the Latin alphabet.