What's 0/0?

It's what called an undefined answer.
Rules for division state that:
a) Any number divided by itself is 1.
b) Any number divided by zero is infinity.
The case of 0/0 is a special one, of course. You can't use either of these rules without breaking the other.

"Result of function is undefined"

0

or infinity

0

infinity

0

infinity

*boom*

= 0

It looks like percent.

Since mathematics doesn't allow for division by zero, I assume that's not an equation...

umm
when no answers are answered correctly out of no questions being asked? lol

In reference to what? If it's sports it means nil all and no one has scored yet. If it's maths it's 0.

equal to 0