By the Qur’an, full of Dhikr!
Bismillah
In one of the most beautiful beginnings of the Qur’an, Allah ta’ala starts surah Saad with a powerful reminder. He says:
ص ۚ وَالْقُرْآنِ ذِي الذِّكْرِ
Saad. And by the Qur’an, full of dhikr! [Surah Saad, verse 1]
This ayah begins with a letter, which are known as: huroof muqatta’aat, the disjointed letters. There are many opinions as to what these letters mean, but the greatest and strongest opinion is that none but Allah ta’ala knows their meanings. But why do some surahs start with these letters, if no one knows the meaning? One reason is that it is for emphasis, and astonishment: here are letters from your own language, yet you cannot produce anything similar to it!