Hebrew letters are much more than just conventional signs created by men to communicate facts and ideas. They are true hieroglyphs, that is, sacred signs that God revealed to mankind so that it was made in his image and likeness, so the letters hide the same mysteries that the Creator and his creation possess. It was not in vain that it was through the letters that the Holy, blessed be, created the world making visible and manifest what was previously only enclosed and hidden in his mind.
The men who know the deep mysteries of the sacred letters are those who possess the greatest gifts that the Creator has bestowed upon their creatures, because through them they can participate in the same power of God. These men are ultimately the great prophets of mankind, because by correctly pronouncing the words composed by the letters "say to God" and act as intermediaries to teach men the divine message of their regeneration. In the Hebrew tradition this teaching is found in the Torah.
Kabbalah would be the art of reading the Torah, with the help of heaven's inspiration. Originally, the Torah was a sequence of letters followed without any punctuation. A cylinder where they were engraved and that could be read in several ways. These hieroglyphic letters held the mystery of God and in unveiling their true meaning the mystery of divine names was understood.
In this app you can explore the Hebrew letters in addition to knowing the meaning of each letter.