A little belated an announcement, but check this out - we drew a set of toki pona hieroglyphs!

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A little belated an announcement, but check this out - we drew a set of toki pona hieroglyphs!
Someone made a comment on the fediverse and got me curious about the history of emoji's four different mailbox symbols. Crossposting here because why not?
( Most of an answer to the question, in 653 words. )