Cyrillic script of Bulgaria to the European Union on 1 January 2007, Cyrillic became the third official script of the European Union, following Latin and Greek. Cyrillic is derived from the Greek uncial script, augmented by letters from the older Glagolitic alphabet, including some ligatures. These additional letters were used for Old Church Slavonic sounds not found in Greek. The script is named in honor of the two Byzantine brothers, Saints Cyril and Methodius, who created the Glagolitic alphabet earlier on. Modern scholars believe that Cyrillic was developed and formalized by early disciples of Cyril and Methodius. In the early 18th century,
Sogdian alphabet also includes several diacritics, which were used inconsistently. It is written from right to left, but by the time it had evolved into its child system, the Old Uyghur alphabet, it had been rotated 90 degrees, written vertically in columns from left to right. Voiced and voiceless fricatives are consistently not distinguished in the script. Aramaic logograms also appear in the script, remnants of adapting the Aramaic alphabet to the Sogdian language. These logograms are used mainly for functional words such as pronouns, articles, prepositions, and conjunctions. The Sogdian alphabet was found inscribed in Panjakent, so we can suppose alphabetisation