The name "Thuluth" means one third, which might refer to the size of the pen used to write the script. It is one of the cursive scripts that were commonly used to decorate mosques and different types of texts, the Thuluth script is marked by its clear structure and readability, which make it suitable for a number of purposes, even today, the cursive letters and long lines make it easily readable and usable for both titles and long texts.
Although rarely used for writing in the Holy Quran it is the most important of all the ornamental scripts and is used for calligraphic inscriptions, titles, headings, colophons and in architectural decorations in many regions of the Islamic Empire.