Mongolian script

The traditional Mongolian script, also known as the Hudum Mongol bichig, was the first writing system created specifically for the Mongolian language, and was the most widespread until the introduction of Cyrillic in 1946. It is traditionally written in vertical lines from top to bottom, flowing in lines from left to right . Derived from the Old Uyghur alphabet, it is a true alphabet, with separate letters for consonants and vowels. It has been adapted for such languages as Oirat and Manchu. Alphabets based on this classical vertical script continue to be used in Mongolia and Inner Mongolia to write Mongolian, Xibe and, experimentally, Evenki.

Computer operating systems have been slow to adopt support for the Mongolian script; almost all have incomplete support or other text rendering difficulties.

The Mongolian vertical script developed as an adaptation of the Old Uyghur alphabet for the Mongolian language. Tata-tonga, a 13th-century Uyghur scribe captured by Genghis Khan, was responsible for bringing the Old Uyghur alphabet to the Mongolian Plateau and adapting it to the form of the Mongolian script.

From the seventh and eighth to the fifteenth and sixteenth centuries, the Mongolian language separated into southern, eastern and western dialects. The principal documents from the period of the Middle Mongol language are: in the eastern dialect, the famous text The Secret History of the Mongols, monuments in the Square script, materials of the Chinese–Mongolian glossary of the fourteenth century and materials of the Mongolian language of the middle period in Chinese transcription, etc.; in the western dialect, materials of the Arab–Mongolian and Persian–Mongolian dictionaries, Mongolian texts in Arabic transcription, etc. The main features of the period are that the vowels ï and i had lost their phonemic significance, creating the i phoneme (in the Chakhar dialect, the Standard Mongolian in Inner Mongolia, these vowels are still distinct); inter-vocal consonants ɣ/g, b/w had disappeared and the preliminary process of the formation of Mongolian long vowels had begun; the initial h was preserved in many words; grammatical categories were partially absent, etc. The development over this period explains why the Mongolian script looks like a vertical Arabic script (in particular the presence of the dot system).

Eventually, minor concessions were made to the differences between the Uyghur and Mongol languages: In the 17th and 18th centuries, smoother and more angular versions of the letter tsadi became associated with /dʒ/ and /tʃ/ respectively, and in the 19th century, the Manchu hooked yodh was adopted for initial /j/. Zain was dropped as it was redundant for /s/. Various schools of orthography, some using diacritics, were developed to avoid ambiguity.

Words are written vertically from top to bottom, flowing in lines from left to right. The Old Uyghur script and its descendants, of which traditional Mongolian is one among Oirat Clear, Manchu, and Buryat are the only known vertical scripts written from left to right. This developed because the Uyghurs rotated their Sogdian-derived script, originally written right to left, 90 degrees counterclockwise to emulate Chinese writing, but without changing the relative orientation of the letters.

The reed pen was the writing instrument of choice until the 18th century, when the brush took its place under Chinese influence. Pens were also historically made of wood, bamboo, bone, bronze, or iron. Ink used was black or cinnabar red, and written with on birch bark, paper, cloths made of silk or cotton, and wooden or silver plates.

Mongols learned their script as a syllabary, dividing the syllables into twelve different classes, based on the final phonemes of the syllables, all of which ended in vowels.