The transposition $\sigma_{ij}$ is a permutation in $S_n$ such that for some $i,j \in {1,\dots ,n}$, \(\sigma_{ij}(i) = j, \sigma_{ij}(j) = i, \text{ and } \sigma_{ij}(k) = k\) for all $k\neq i,j$.
Equivalently, a transposition is a 2-cycle.
Wikidata ID: Q2666112