What are "exotic character sets"?

Question

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

Wide characters are used mainly to represent non-English or exotic character sets.

What's the exactly meaning for exotic character sets?

Answer 1

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, ...).

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