This property defines the Unicodes which has Jamo Short Name as LM
Characters like ᆱ, etc. are listed under LM Jamo Short Name.
1 Characters are present in LM Jamo Short Name starting with the Unicode point U+11B1 that represents the character ᆱ.
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.