Prefix

In Arabic, kāf, when used as a prefix كَـ ka, functions as a comparative preposition (أداة التشبيه, such as مِثْل /miθl/ or شَبَه /ʃabah/)^[3] and can carry the meaning of English words "like", "as", or "as though" . For example, كَطَائِر (/katˤaːʔir/), means "like a bird" or "as though a bird" (as in Hebrew, above) and attached to ذٰلِك /ðaːlik/ "this, that" forms the fixed expression كَذٰلِك /kaðaːlik/ "like so, likewise."

Possessive suffix

When adjoined at the end of a word, kāf is used as a possessive suffix for second-person singular nouns (feminine taking kāf-kasrah كِ, /ki/ and masculine kāf-fatḥah كَ /ka/); for instance, كِتَاب kitāb ("book") becomes كِتَابُكَ kitābuka ("your book", where the person spoken to is masculine) كِتَابُكِ kitābuki ("your book", where the person spoken to is feminine). At the ends of sentences and often in conversation the final vowel is suppressed, and thus كِتَابُك kitābuk ("your book"). In several varieties of vernacular Arabic, however, the kāf with no harakat is the standard second-person possessive, with the literary Arabic harakah shifted to the letter before the kāf: thus masculine "your book" in these varieties is كِتَابَك kitābak and feminine "your book" كِتَابِك kitābik.

Kaf with the dagesh

When the kaph has a "dot" in its center, known as a dagesh, it represents a voiceless velar plosive (/k/). There are various rules in Hebrew grammar that stipulate when and why a dagesh is used.

Kaf without the dagesh (khaf)

When this letter appears as כ‎ without the dagesh ("dot") in its center it represents [χ], like the ch in German "Bach".

In modern Israeli Hebrew the letter heth is also often pronounced as a [χ]. However, Mizrahi Jews and Israeli Arabs have differentiated between these letters as in other Semitic languages.

Final form of kaf

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Orthographic variants
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ך	ך	ך

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If the letter is at the end of a word the symbol is drawn differently. However, it does not change the pronunciation or transliteration in any way. The name for the letter is final kaf (kaf sofit). Four additional Hebrew letters take final forms: mem, nun, pei and tsadi. Kaf/khaf is the only Hebrew letter that can take a vowel in its word-final form, which is pronounced after the consonant, that vowel being the qamatz.