Is there a standard mathematical way to write "OR"

I'm doing some simple stats work and I want to write something like
Pr(X = 0 or X = 1)
does maths have an OR operator?

I'm a programmer at heart so I write || but I don't think anyone but me will understand it. :P

Yes I am that lazy.

∨ is the logical OR (U+2228) (not V or v)
∧ is the logical AND (U+2227)