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