This property defines the Unicodes which are used for positions between two letters
Characters like :,·,·, etc. are listed under MidLetter Word Break.
9 Characters are present in MidLetter Word Break starting with the Unicode point U+003A that represents the character :.
Currently, as per latest version 15.0.0, Unicode supports 19 number of Word Break. Here are a few examples - Carriage Return,Double Quote,Exclamation, etc.