Modern Hebrew languages that it is genealogically a hybrid with Indo-European. These theories have not been met with general acceptance, and the consensus among a majority of scholars is that Modern Hebrew, despite non-Semitic influences, can correctly be classified as a Semitic language. Modern Hebrew is written from right to left using the Hebrew alphabet, which is an abjad, or consonant-only script of 22 letters based on the "square" letter form, known as "Ashurit" (Assyrian), which was developed from the Aramaic script. A cursive script is used in handwriting. When necessary, vowels are indicated by diacritic marks above or below the letters
About the Mystery of the Letters Father respectively. The final chapters of the treatise engage in speculation about more general topics, including the history of mankind – whose key events are related symbolically to the sequence of vowels and consonants in the alphabet –, a discussion of Christology dealing with issues related to the Council of Chalcedon, and reflections upon the name of "Adam". About the Mystery of the Letters About the Mystery of the Letters (, "Peri tou mystēriou tōn grammatōn") is an anonymous Christian treatise containing a mystical doctrine about the names and forms of the Greek and Hebrew letters. It was probably written