Let $G$ be a finite group and $a\in G$. The period of $a$ is the order of $\langle\{a\}\rangle$, the subgroup generated by $\{a\}$.
Let $G$ be a finite group and $a\in G$. The period of $a$ is the order of $\langle\{a\}\rangle$, the subgroup generated by $\{a\}$.