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 alphabet to U+05FF and from U+FB1D to U+FB4F. It includes letters, ligatures, combining diacritical marks ("Niqqud" and cantillation marks) and punctuation. The Numeric Character References is included for HTML. These can be used in many markup languages, and they are often used in Wiki to create the Hebrew glyphs compatible with the majority of web browsers. Standard Hebrew keyboards have a 101-key layout. Like the standard QWERTY layout, the Hebrew layout was derived from the order of letters on Hebrew typewriters. "Alef-bet" is commonly written in Israeli Hebrew without the "" (, "[Hebrew] hyphen"), , as opposed to with the hyphen,