Modern Hebrew is written from right to left using the Hebrew alphabet, which is an abjad, or consonant-only script of 22 letters. The ancient paleo-Hebrew alphabet is similar to those used for Canaanite and Phoenician. Modern scripts are based on the “square” letter form, known as Ashurit (Assyrian), which was developed from the Aramaic script. A cursive Hebrew script is used in handwriting: the letters tend to be more circular in form when written in cursive, and sometimes vary markedly from their printed equivalents. The medieval version of the cursive script forms the basis of another style, known as Rashi script. When necessary, vowels are indicated by diacritic marks above or below the letter representing the syllabic onset, or by use of matres lectionis, which are consonantal letters used as vowels. Further diacritics are used to indicate variations in the pronunciation of the consonants (e.g. bet/vet, shin/sin); and, in some contexts, to indicate the punctuation, accentuation, and musical rendition of Biblical texts (see Cantillation).