This is not the union symbol right over here. Or we could literally write this as U and then we write that little slash looking thing, U slash A. So how do we represent that in the Venn diagram? Well, it would be all the stuff in U, it would be all the stuff in U that is not in A. One way to think about it, you could think about it as the relative complement of A that is in U, but when you're taking the relative complement of something that is in the universal set, you're really talking about the absolute complement. Or when people just talk about the complement, that's what they're saying. What's the set of all the things in my universe that are not, that are not in A?