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
Hebrew Braille as follows: Hebrew Braille Hebrew Braille () is the braille alphabet for Hebrew. The International Hebrew Braille Code is widely used. It was devised in the 1930s and completed in 1944. It is based on international norms, with additional letters devised to accommodate differences between English Braille and the Hebrew alphabet. Unlike Hebrew, but in keeping with other braille alphabets, Hebrew Braille is read from left to right instead of right to left., and unlike English Braille, it is a Abjad, all consonants. Prior to the 1930s, there were several regional variations of Hebrew Braille, but no universal system. In