π can stand for a variety of things in maths, but is 3.14159... the only constant it's conventionally used for?
and the same question, but for e
I'm also interested in any non-number constants with conventional names that you're aware of. At the moment I've only got ∅, for the empty set, and e for the identity permutation
ooh! i, j and k basis vectors!
Complete graphs! K₅ etc
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