This property defines the Unicodes which has Jamo Short Name as J
Characters like ᄌ,ᆽ, etc. are listed under J Jamo Short Name.
2 Characters are present in J Jamo Short Name starting with the Unicode point U+110C that represents the character ᄌ.
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.