Main reason people use Greek letters in math: makes it harder for outsiders to consume and signals in-group statushttps://twitter.com/id_aa_carmack/status/904695689384484865 …
Though some people may do this, other reasons are custom, visual distinctiveness, and shortage of letters.
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E.g. I use theta for angles in code, and it's hard to think of an alternative. I can't use t, because that's already taken for truth.
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