Arabic typography is the typography of letters, graphemes, characters or text in Arabic script, for example for writing Arabic, Persian, or Urdu. 16th century Arabic typography was a by-product of Latin typography with Syriac and Latin proportions and aesthetics. It lacked expertise in the three core aspects of Arabic writing: calligraphy, style and system. Calligraphy requires aesthetically skilled writing in a chosen canonical style such as naskh, nastaʿlīq or ruqʿah. System denotes the script grammar covering such rules as horizontality and stretching.