Kaf is a letter of the Arabic alphabet with a numerical value of 20. Kaaf’ is the twenty-second letter of the Arab alphabet. It represents number twenty and belongs to the element of water. It symbolizes the verb of creation, i.e. kun (= be!). Shaykh ad-Dabbaagh informs us that the ‘kaaf’ corresponds to knowledge of God, the Elevated, which is a part of prophecy. Cited from Website