History of the Greek alphabet retained the sound. A symbol based on the left-hand half ( ├ ) of the letter Η was therefore sometimes used to indicate the presence of where necessary, and its absence was indicated by a symbol based on the right half. During the classical period, ΕΙ came to be pronounced and ΟΥ came to be pronounced , Υ having meanwhile moved to . By about 200 BC, a system of diacritical marks was invented, representing the tone accents in use in Ancient Greek. This also helped to indicate the length of the vowels Α, Ι, and Υ in certain cases
Alphabet of the Magi the prophets used this letter and that they were forbidden to divulge it to mortal man." Thet alphabet is described in the pseudo-Paracelsian "Archidoxis magica", translated into English by R. Turner (1656). S.L. MacGregor Mathers included it in his 1888 edition of the "Key of Solomon" (plate XV) under the name "Alphabet of the Magi." Alphabet of the Magi Alphabet of the Magi is the modern name of a variant of the Hebrew alphabet used for inscriptions in talismans in 17th-century occultism. It is based on a variant of the Semitic alphabet given by Theseus Ambrosius (1469–1540) in his "Introductio