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
Arabic alphabet dots above; the letter ن (n) also has the same form in initial and medial forms, with one dot above, though it is somewhat different in isolated and final form. Both printed and written Arabic are cursive, with most of the letters within a word directly connected to the adjacent letters. There are two main collating sequences for the Arabic alphabet: abjad and hija. The original "" order (), used for lettering, derives from the order of the Phoenician alphabet, and is therefore similar to the order of other Phoenician-derived alphabets, such as the Hebrew alphabet. In this order, letters