Definition:Pairwise Disjoint

Let $$\mathbb {S}$$ be a set of sets such that:

$$\forall T_1, T_2 \in \mathbb {S}: T_1 \cap T_2 = \varnothing$$

Then the sets in $$\mathbb {S}$$ are said to be pairwise disjoint or mutually disjoint.