I have never heard a more beautiful and pleasant voice from God.The secret letters are found in 29 surahs in the Holy Quran. And these letters are a secret between the great God and his last prophet (peace and blessings of God be upon him) and normal human understanding has no way to them .Unless by thinking about the divine verses and authentic traditions, it is only possible that they refer to this issue . Some of these secret letters, such as the letter (Kaf) are found in only one surah, and some such as the letter (Meem) are found in 17 surahs, And the knowledge of these secret letters is only in the possession of the Prophet of Islam and the infallible imams (may the peace and blessings of God be upon them).Research has also been done about these secret letters, which are in the form of a book, and if desired, it will be available to the esteemed buyer of this nft, and the book file will be sent to the dear buyer in PDF format