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That’s unavoidable given the goal: Unicode provides a unique number for every character, no matter what the platform, no matter what the program, no matter what the language.

https://www.unicode.org/standard/WhatIsUnicode.html

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What does "every character" mean? Did it really need to include emojis, for example? Domino tiles? Alchemical symbols? A much smaller number of characters would have been sufficient for all but a tiny number of cases.
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The stated goal of Unicode is to support every past and present writing system in world world. Say what you will about that but I think just because a symbol's meaning might be obscure to us doesn't mean it isn't useful to someone else.
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