Qaf is a letter of the Arabic Alphabet with a numeric value of 100 like Qoph and Rho. The ‘qaaf’ is the twenty-first letter of the Arabic alphabet. It represents the number one hundred and belongs to the element of water. ‘Qaaf’ is also the name of a legendary mountain. It is a special letter, since it is the title of the fiftieth verse of the Qur’an, whose opening verse reads as follows: “Qaaf. By the majestic Qur’an!”. Cited from website Chisihti