(Arabic: ثُلُث, “one-third”).  A calligraphy style first developed during the Islamic Abbasid dynasty in the 11th century. Thuluth is an elegant, cursive script, used for mosque decorations, surah headings in Qur’ans, and titles of nobility on portable objects. Web resource here.

Inlaid brass pyxis with inscription in thuluth. Mamluk period. First half of the 14th c.  Kuwait National Museum, Kuwait City.