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what are the charecter set used in ISO 10646-1?
The above seems like a definition of a character set. So the character set used is quite likely to be ISO 10646-1 ;)
Anyway - it is more or less Unicode. Unicode originally tried to target all living languages, but reserved too little room for all chinese characters.
This has later been corrected and the goal of both standards is to also include all other symbols and characters in use or from now dead languages.
Why do you ask on a Kiel forum?