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
Biblical Hebrew phonemes. After a sound shift the letters , could only mark one phoneme, but (except in Samaritan Hebrew) still marked two. The old Babylonian vocalization system wrote a superscript above the to indicate it took the value , while the Masoretes added the shin dot to distinguish between the two varieties of the letter. The original Hebrew alphabet consisted only of consonants, but gradually the letters , , , , also became used to indicate vowels, known as "matres lectionis" when used in this function. It is thought that this was a product of phonetic development: for instance, *bayt ('house')