Thuluth script was first formulated in the 7th century at the time of the Umayyad caliphate , but it did not progress
entirely until the late 9th century
. The name means ‘a third’ — maybe due to the proportion of straight lines to curves , or maybe because the script was a third the size of another common contemporary script . Though rarely utilized for writing the Holy Qur’an , Thuluth has enjoyed great popularity as an ornamental script for calligraphic inscriptions , titles , headings , and colophons . It is still the most crucial of all the ornamental scripts .
Thuluth script is characterized by curved letters written with barbed heads . The letters are associated and sometimes intersecting , thus engendering a cursive flow of extensive and often complex proportions . Thuluth is known for its elaborate graphics and stunning plasticity .
Thuluth assumed some of the features of the early Kufic script : it was used to write Sura headings , religious inscriptions , and princely titles as well as epigraphs . It was also used for many of the massive copies of the Qur’an produced from the 13th century . It remains the most significant of all the ornamental scripts .
Some experts say you are not a calligrapher unless you can write Thuluth .