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๐: What Comes After ๐?
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this post was submitted on 30 Apr 2024
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If โ is natural numbers and โ is rational numbers and โค is integers and โ is the rational numbers, what are ๐ and ๐?
Not aware of any specific usages, but maybe they're used as meta-sets. e.g. "consider a set of numbers ๐ and a set of numbers ๐ ... etc, which can't be done with the defined letters.
Unicode originally only had the double-struck letters for the defined sets โ, โ, โ, โ, โ, โ and โค, but the full alphabets were later added at higher code-points with "reserved" gaps where the defined seven letters would otherwise appear.
(Complex, Hamiltonian quaternions, Natural, Prime, Quotient (rational), Real and Zahlen, a German word for counting numbers, for anyone wondering.
Quick edit: Zahl is cognate with English "tell" and "tale" which are both related to "tally", believe it or not. "Recounting a tale" didn't used to mean telling(!) a story, but instead literally checking a previous count, and developed the wider sense later.
Also, โ not getting "โ" because โ couldn't have "โ" is kind of funny.).