This property defines the Unicodes which have Bidirectional Class as Left to Right Letter
Characters like A,B,C, etc. are listed under Left to Right Letter Bidi Class.
138355 Characters are present in Left to Right Letter Bidi Class starting with the Unicode point U+0041 that represents the character A.
Currently, as per latest version 15.0.0, Unicode supports 23 number of Bidi Class. Here are a few examples - Arabic Letter,Arabic Number,Block Separator, etc.