By the pronunciation of Tin Kul Bengali we mean Surah Ikhlas, Surah Falak and Surah Nas - these three Surahs. These three surahs have the word 'Qul' at the beginning, so they are collectively called the three Qul Surahs. This surah is the last surah of the three Holy Quran Sharif. https://www.blogger.com/blog/post/edit/277985083674831363/2027872965287682844