This property defines the Unicodes which are used for positions before and after katakana characters
Characters like 〱,〲,〳, etc. are listed under Katakana Word Break.
331 Characters are present in Katakana Word Break starting with the Unicode point U+3031 that represents the character 〱.
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.