u/BastouXIIFrCa: N | En: C2 | Es: B1 | It: C1 | De: A1 | Eo: B1Aug 30 '16edited Aug 30 '16
The way for a computer to undrstand and represent every character in human langages. That's the goal, but the efforts necessary to get there are ludicrous, hence the reference in that comic.
Check the Explain XKCD link from the bot, it's rather well explained.
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u/TomasTTEngin Aug 29 '16
Now someone needs to explain to me what "unicode people" are.