Kaph is thought to be derived from a pictogram of the palm of a hand (in both modern Arabic and Hebrew, kaphכַּף means "palm" or "grip"), though in Arabic the a in the name of the letter (كاف) is pronounced longer than the a in the word meaning "palm" (كَف). The small ک above the kāf in its final and isolated forms ⟨كـك⟩ was originally ‘alāmatu-l-ihmāl, but became a permanent part of the letter. Previously this sign could also appear above the medial form of kāf, instead of the stroke on its ascender.
The cross-barred form, al-kāf al-maškūlah or al-kāf al-mašqūqah, is the Nastaliq form used predominantly in the Perso-Arabic script and as an alternative form of the version above in all forms of Arabic. It has a particular use in the Sindhi language of Pakistan where it represents the aspirated /kʰ/ and is called keheh.
The long s-shaped variant form, al-kāf al-mabsūṭah, which is used in Arabic texts and in Thuluth and Kufic. It is a separate letter in the Sindhi language of Pakistan, where it represents the unaspirated /k/.
the letter kāf with one dot below is also used in the Pegon alphabet for writing Javanese and Sundanese in Arabic script, but is also used in the Arwi alphabet for the Tamil language to represent /ɡ/, and it is thus written as:
Before 1928, the Nogai alphabet was written in Arabic script. There is one such letter based on a basic form of kāf with three dots below, and it is thus written as:
In Arabic, kāf, when used as a prefix كَـka, functions as a comparative preposition (أداة التشبيه, such as مِثْل/miθl/ or شَبَه/ʃabah/) 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-kasrahكِ, /ki/ and masculine kāf-fatḥahكَ/ka/); for instance, كِتَابkitāb ("book") becomes كِتَابُكَkitābuka ("your book", where the person spoken to is masculine) كِتَابُكِkitābuki ("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 كِتَابُكkitābuk ("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 كِتَابَكkitābak and feminine "your book" كِتَابِكkitābik.
Hebrew kaf
The Hebrew letter Kaf (Hebrew: כַּף, romanized:kap̄) represents the phonemes /k/ and /x/. The former value /k/ is common for all pronunciations of Hebrew and is pronounced [k], while the latter /x/ is classically pronounced as the former's fricative counterpart [x]. It shifted to be pronounced [χ] in some traditions, notably in Ashkenazi Hebrew and by extension, most speakers of Israeli Hebrew.
The letter has two pronunciations — one plosive /k/ and its fricative counterpart /x/, making it a begadkefat letter. A dagesh qal (dot) written in the letter represents that the plosive value should be taken; The lack thereof — the fricative.
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