This property defines the Unicodes which are Leading Jamo Hangul Syllable Type
Characters like ᄀ,ᄁ,ᄂ, etc. are listed under Leading Jamo Hangul Syllable Type.
125 Characters are present in Leading Jamo Hangul Syllable Type starting with the Unicode point U+1100 that represents the character ᄀ.
Currently, as per latest version 15.0.0, Unicode supports 5 number of Hangul Syllable Type. Here are a few examples - Leading Jamo,Leading Vowel Jamo,Leading Vowel Trailing Jamo, etc.