What are "exotic character sets"?

I am reading an c++ document, it said as this,

Wide characters are used mainly to represe开发者_StackOverflow中文版nt non-English or exotic character sets.

What's the exactly meaning for exotic character sets?

I think it has no "technical" meaning, it's used as in "strange" or "unusual" character sets.

Since we're talking about wide characters, in general we are actually talking about Unicode; I'd say that Cuneiform or Klingon¹ could be considered as "exotic character sets". Or even those Unicode blocks not intended for languages, but for symbols of various nature (mathematical symbols, arrows, alchemical symbols, ...).

1. Not actually included in the Unicode standard, but available in the PUA of some fonts (link).

I think the author means characters such as : § ¨ © ¢ ¡ U ï ð ¥ ¦ â ß à á â ã ¶ æ and suchlikes!

Maybe special charset that are used mainly for printing symbols or older charset as IBM's EBCDIC.