Old Turkic inscriptions of 7-12th centuries. Türük bitig – Turkic bitig, bitig is original Turkic writing. It originated from ancient symbolic (graphic) inscriptions of ancient Turks, and based on it a morpho-phonemic writing accurately marks the nature of the ancient Turkic language, and was able to gather many old Turkic dialects in one spelling. This script could simplify reading of Old Turkic texts. The phonological structure of Old Turkic Writing is distinguished by the individual and complex reading of vowel and consonant sounds.
The operation area of the Old Turkic writing stretched from Mongolia, Altai, Tuva, Khakassia - Yenisei, Abakan, Kem River, Buryatia - Baikal, Lena, Sakha, East Turkestan - Turfan Lowland, Dunhuan, Miran, to Kazakhstan - Irtysh, Talas, Ili, Ural rivers, Ferghana, and further to North Caucasus, Eastern Europe. It is known that this is a vast area occupying the entire Eurasian continent. The Old Turkic writing is a witness and commonwealth of the indigenous spiritual culture of today's Turkic ethnics. Hence, the Old Turkic writing is one of the greatest heritages of the world civilization.
Most of ancient monuments of Old Turkic era were written with Old Turkic writing in Old Turkic language. There are also several ancient monuments with inscription in two or more languages, some of them are “Suuj” Old Turkic monument with Old Turkic, Sogdian inscriptions, Tatpar Khagan monument ("Bugat") with Old Sogdian, Brahmi inscriptions, Niri Khagan sculpture (Mongolian Churee) with Old Sogdian, Brahmi inscriptions, the Karabalgasun-1 monument with Old Turkic, Sogdian, Chinese inscriptions. These monuments indicate that relations between Turkic people, Sogdians and Chinese people were at a high level.