K.H.Y.`A.S. (Kaaf Ha Ya `Ayn Saad)

K.
H.
Y.
A.
S.

This is the longest set of initials, consisting of five letters, and it occurs in one chapter, Sura 19. The letter "K" in chapter 19 occurs 137 times, "H" occurs 175 times, "Y" occurs 343 times, " `A" occurs 117 times, and "S" (Saad) occurs 26 times. Thus, the total occurrence of the five letters is 137+175+343+117 26 = 798 = 19x42. Removing only one letter from the Quran destroys the mathematical miracle of the Quran.