About the Mystery of the Letters the mid-6th century, in which Mar Saba had played an important role. The anonymous author of the treatise declares he was prompted to the study of the secret meanings of the letters by the words of the Apocalypse, "I am the Alpha and Omega", and that he subsequently received a vision about them on Mount Sinai. The author proposes a re-modelled Greek alphabet reduced to 22 letters on the model of the 22 letters of Hebrew (discounting Xi Ξ and Psi Ψ), and with the Hebrew letter names. He then interprets these letters as symbolic figures of 22 works of
Paleo-Hebrew alphabet use the Paleo-Hebrew alphabet. During the 3rd century BCE, Jews began to use a stylized, "square" form of the Aramaic alphabet that was used by the Persian Empire (which in turn was adopted from the Assyrians), while the Samaritans continued to use a form of the Paleo-Hebrew script, called the Samaritan script. After the fall of the Persian Empire, Jews used both scripts before settling on the Assyrian form. For a limited time thereafter, the use of the Paleo-Hebrew script among Jews was retained only to write the Tetragrammaton. The independent Hebrew script evolved by developing numerous cursive features, the