this post was submitted on 25 Jul 2026
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We do technically use Ø for empty sets or as diameter in mathematics, and diacriticals are technically allowed in English but we really only use them to describe phonetics.
I could have sworn it had use in either spherical or polar coordinate systems but I guess I was misremembering.
You might be thinking of Theta: θ
Nah I think it was Phi throwing me off if anything.