Arabic typography
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. Characteristics. Some characteristics used in Latin scripts, like bold, letter spacing or italic, are not  usually used in Arabic typography. Calligraphic style. Some Arabic fonts are calligraphic, for example Arial, Courier New, and Times New Roman. They look as if they were written with a brush or oblong pen. Other fonts use a mono-linear style more akin to sans-serif Latin scripts. Monolinear means that the lines have the same width throughout the letter. Overlines. Historically, Arabic text used overlines instead of underlines used in Latin script. Slant (italic). Some Arabic styles such as Diwani use a right-to-left downward-sloping slant. Use of right angles. Some fonts use more right angles, for  example Noto Kufi Arabic. Others, like Tahoma and Arial, have a more rounded style (see graph below). A font with tendency towards right angles is also called 'angled', and rounded fonts are also called 'cursive'.