https://unicode-org.github.io/icu-docs/apidoc/dev/icu4j/com/ibm/icu/lang/UCharacter.JoiningType.html
UCharacter.JoiningType (ICU4J 78)
https://developer.android.google.cn/reference/kotlin/android/icu/lang/UCharacter.JoiningType
UCharacter.JoiningType | API reference | Android Developers
api referenceandroiddevelopers