Zanabazar had created it for the translation of Buddhist texts from Sanskrit or Tibetan, and both he and his students used it extensively for that purpose. Aside from historical texts, it can usually be found in temple inscriptions. It also has some relevance to linguistic research, because it reflects certain developments in the Mongolian language, such as that of long vowels. Horizontal square script At around the same time, Zanabazar also developed the horizontal square script (Хэвтээ дөрвөлжин), which was only rediscovered in 1801. The script's applications during the period of its use are not known. It was also largely based on the Tibetan alphabet, read left to right, and employed vowel diacritics above and below the consonant letters. Additionally, a dot was used below consonants to show that they were syllable-final. Horizontal square script is included in the Unicode Standard under the name "Zanabazar Square". The Zanabazar Square block, comprising 72 characters, was added as part of Unicode version 10.0 in June 2017. Foreign scripts Before the 13th century, foreign scripts such as the Uighur and the Tibetan scripts were used to write the Mongolian language. Even during the reign of the Mongol Empire, people in the conquered areas often wrote it in their local systems. In some cases it was transcribed phonetically using Chinese characters, as is the case with the only surviving copies of The Secret History of the Mongols. Subjects from the Middle East hired into administrative functions would also often use Perso-Arabic script to write their Mongolian language documents. Latin script On 1 February 1930, Mongolia officially adopted a Latin alphabet. On 25 March 1941, the decision was reversed. According to later official claims, the alphabet had turned out to have not been thought out well. It was said not to distinguish all the sounds of the Mongolian language, and was difficult to use. However, those seem to have been pretexts rather than the true reasons. Using "y" as feminine "u" , with additional feminine "o" ("ө") and with additional consonants "ç" for "ch" , "ş" for "sh" and ƶ for "zh" , it successfully served in printing books and newspapers. Many of the Latin letters (f, h, p, v) were even rarely used while q, w and x were completely excluded. The adoption of the Cyrillic script a short time later, almost simultaneously with most Soviet republics, suggests political reasons. In the advent of