That's right. But more responses are welcome. Even I want to know what other things turns big when turned upside down
Now I can give a try. A when turned upside down becomes big i.e. to an extent V. Yes I know its not very convincing
Just thought would add that if you think something else could also be an answer post it once again with reference to this thread that what else if you want to.
Just a generalization of my answer : Any combination of 0, 6, 8 and 9 (Other digits might not be readable when turned upside down) starting with 6 becomes bigger than itself when turned upside down.