The word(s) "letter" appears 33 time(s) in 33 verse(s) in Quran in Mohsin Khan translation.

(11) Kaf-Ha-Ya-'Ain-Sad. [These letters are one of the miracles of the Qur'an, and none but Allah (Alone) knows their meanings].

(12) Ta-Ha. [These letters are one of the miracles of the Qur'an, and none but Allah (Alone) knows their meanings].

(13) Ta-Sin-Mim. [These letters are one of the miracles of the Qur'an, and none but Allah (Alone) knows their meanings.]

(14) Ta-Sin. [These letters are one of the miracles of the Qur'an, and none but Allah (Alone) knows their meanings]. These are the Verses of the Qur'an, and (it is) a Book (that makes things) clear:

(15) "Go you with this letter of mine, and deliver it to them, then draw back from them, and see what (answer) they return."

(16) She said: "O chiefs! Verily! Here is delivered to me a noble letter,

(17) Ta-Sin-Mim [These letters are one of the miracles of the Qur'an, and none but Allah (Alone) knows their meanings].

(18) Alif-Lam-Mim. [These letters are one of the miracles of the Qur'an, and none but Allah (Alone) knows their meanings.]

(19) Alif-Lam-Mim. [These letters are one of the miracles of the Qur'an, and none but Allah (Alone) knows their meanings].

(20) Alif-Lam-Mim. [These letters are one of the miracles of the Qur'an, and none but Allah (Alone) knows their meanings].