Definition:Range of Relation

Definition
The range of a relation $$\mathcal{R} \subseteq S \times T$$ is the set $$T$$ and is denoted $$\mathrm {Rng} \left({\mathcal{R}}\right)$$ or $$\mathrm {Ran} \left({\mathcal{R}}\right)$$.

Some authors use the term codomain instead of range.

Also see

 * Domain
 * Image