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I thought it was an easy question ...
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A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.
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This is a science community. We use the Dawkins definition of meme.
If you want a clear definition, ask a mathematician:
Or a computer scientist:
Meanwhile, in Unicode land...
Maybe ironically, neither one would be appropriate as a linguistic definition.
i wonder what the inverse of the letters in the english alphabet are. since it has a non-prime number of letters (26 to be exact), we know that some letters won’t have inverses. i wonder which letters don’t have inverses. i guess it would be pretty easy to find out if you use the standard alphabet ordering and then port the alphabet over to ℤ/26ℤ, but that’s not a particularly satisfying answer.
Or, in either field (formal language theory bridges both) it can mean any string of symbols, letters, or tokens.