Scholars hold different views on whether the"()"and"()"following vowels in the words of Uighurjin Mongolian or current Mongolian text are syllables,compound vowels,or syllable-ending consonants.In Mongolian script,"()"and"()"are polyphonic,corresponding to consonant"y"and vowel"i"in words.Therefore,it is difficult to determine their nature solely from literature in Mongolian script or the characters themselves.Based on Mongolian literature in the Brahmi script,Mongolian literature in the'Phags-pa script,and Mongolian literature in the Todo script from different periods,this article explains the nature and evolutionary patterns of the character sequences corresponding to"()"and"()".It is believed that in ancient Mongolian words,"()"after vowels represents a separate syllable"yi",but by the middle Mongolian period,with the gradual prominence of the vowel property of"y",this writing form also changed,where it remains a single syllable in the word,but at the end of the word,it becomes a component of a compound vowel.Furthermore,in Todo or modern Mongolian script,both in the middle and at the end of the word,it has become the elements constituting a compound vowel.
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