Yi Syllables is a
Unicode block containing the characters of the
Liangshan Standard Yi script for writing the
Nuosu, or Yi, language.
Syllables

Note that the name for U+A015 is a misnomer, as the character is actually a syllable iteration mark corresponding to "w" in Yi romanization.
Unicode Name Aliases
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Block
History
The following Unicode-related documents record the purpose and process of defining specific characters in the Yi Syllables block:
Notes
References
Unicode chart Yi syllables (pdf)
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Unicode blocks