The letters here are known as Huroof-e-Muqatta’at (the disconnected or broken letters). The is a combination of letters found at the beginning of 29 surahs in the Quran. Numerous books have been written on the meaning of these words. The only absolute truth is that Allah S.W.T has kept the meaning hidden. However, many learned scholars are of the opinion that the wisdom behind the words was a challenge from Allah S.W.T to the Quraish, that the Quran was revealed using their own letters and words, yet they would never be able to combine those letters to produce anything of its sort. May Allah S.W.T allow us to gain from the benefits of reciting the Quran.