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 of the Hebrew alphabet used to write Yiddish, is a true alphabet, with all vowels rendered in the spelling, except in the case of inherited Hebrew words, which typically retain their Hebrew spellings. The Arabic and Hebrew alphabets have similarities because they are both derived from the Aramaic alphabet. A distinct Hebrew variant of the Phoenician script, called by scholars the paleo-Hebrew alphabet, emerged around 800 BCE. Examples of related early inscriptions from the area include the tenth-century Gezer calendar, and the Siloam inscription (c. 700 BCE). The paleo-Hebrew alphabet was used in the ancient kingdoms of Israel and Judah.