This property defines the Unicodes which has Jamo Short Name as YI
Characters like ᅴ, etc. are listed under YI Jamo Short Name.
1 Characters are present in YI Jamo Short Name starting with the Unicode point U+1174 that represents the character ᅴ.
Currently, as per latest version 15.0.0, Unicode supports 53 number of Jamo Short Name. Here are a few examples - A,AE,B, etc.