Definition:Symmetric Difference/Definition 3

Definition
The symmetric difference between two sets $S$ and $T$ is written $S \symdif T$ and is defined as:
 * $S \symdif T = \paren {S \cap \overline T} \cup \paren {\overline S \cap T}$

where:
 * $\cap$ denotes set intersection
 * $\cup$ denotes set union
 * $\overline S$ denotes the complement of $S$.

Also see

 * Equivalence of Definitions of Symmetric Difference