This property defines the Unicodes which allows line break before it except when it follows a numeric character
Characters like !,?,׆, etc. are listed under Exclamation Line Break.
40 Characters are present in Exclamation Line Break starting with the Unicode point U+0021 that represents the character !.
Currently, as per latest version 15.0.0, Unicode supports 43 number of Line Break. Here are a few examples - Alphabetic,Alphabetic or Ideograph,Break After, etc.