Quran code
The term Quran code (also known as Code 19) refers to the claim that the Quranic text contains a hidden mathematically complex pattern. The claimed code is based on alleged multiple appearances of the number in 19 in counts of words, letters and surahs. Advocates believe that the code represents a mathematical proof of the divine authorship of the Quran. The most notable proponent was Rashad Khalifa.