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What is the technically correct way of referring to "high ascii" or "extended ascii" characters? I don't just mean the range of 128-255, but any character beyond the 0-127 scope.
Often they're called diacritics, accented letters, sometimes casually referred to as "national" or non-English characters, but these names are either imprecise or they cover only a subset of the possible characters.
What correct, precise term that will programmers immediately recognize? And what would be the best English term to use when speaking to a non-technical audience?
"Non-ASCII characters"
"Extended ASCII" is the term I'd use, meaning "characters beyond the original 0-127".
Unicode is one possible set of Extended ASCII characters, and is quite, quite large.
UTF-8 is the way to represent Unicode characters that is backwards-compatible with the original ASCII.