The overwhelmingly consonantal nature of the Arabic alphabet is well suited to the Semitic roots of the Arabic language. Written from right to left, Arabic is a cursive script in which most letters connect with their neighbors.
Arabic script has no block letters, nor does it distinguish letters as upper or lower case.
However, it should be noted that the use of diacritics is usually restricted to Koranic, educational, poetic and unusually complex texts. For instance, diacritics almost never appear in newspapers. Although Arabic text flows in general from right to left, numbers, which are referred to as 'Indian numbers', are written from left to right. For this reason, Arabic script is sometimes described as bidirectional. Since the Nabatean language had fewer sounds than Arabic, the first forms of Arabic script suffered some deficiencies.