It is Meccan, except for His saying وَالشُّعَراءُ ... until the end of the surah, which consists of two hundred and twenty-seven verses. In another narration: twenty-six verses [were revealed after the event]. 'In the name of Allah, the Most Gracious, the Most Merciful.' Taa-Siin-Miim, with the 'alif' pronounced emphatically and tilted, and the 'noon' pronounced clearly and then merged. The Book, the Clear, is evident in its miraculous nature and the correctness that it is from Allah. It refers to the surah or the Qur'an. The meaning is: The verses of this composition from the extended letters, those are the verses of the Clear Book.