This script is used to write the Georgian language, by over 3.5 million people, as well as for writing other Kartvelian languages in the Caucasus, including Mingrelian and Svan. Its origins are unclear, although legends attribute it to King Pharnavaz of ancient Kartli. The script was likely modelled on the Greek script and follows its alphabetical order, like the Armenian script. Four writing style variants for the script exist: ancient Asomtavruli letters, scribal Nuskhuri letters (often used alongside Asomtavruli letters), Mkhedruli letters and Mtavruli letters. Each variant has its own distinctive elements and is used for different functions, and represents evolution in letterforms. Contemporary writing in the script primarily uses Mkhedruli letters, although Mtavruli letters are often used for titles, headings and in similar contexts. Letter case in Georgian is more accurately described as represented using these two different writing styles in tandem, i.e. Mkhedruli for general use and Mtavruli for emphasis. Asomtavruli and Nuskhuri letters are no longer widely used.