Here is a simple riddle for you:
I stand for nothing but I am everything, with 100%.
There are ideas wanting to replace me with something that can stand for more but can't even decide what it is.
I stand for information but I can only answer a yes/no question.
I am contained in this riddle but you cannot see me.
The romans only knew half of me but nowadays I am more important than ever.
Who am I?