What is a matrix $A$ satisfying $A^m=I$ called? We have matrices that are idempotent $A^2=A$ or nilpotent $A^m=0$ for some $m$.
Question: What is a square matrix $A$ called for which $A^m=I$ for some integer $m$, where $I$ is the identity matrix?
Examples are rotations by $2\pi/m$. 
Any reference would be appreciated!

Such matrix $A$ is a matrix of finite order. You can find a classification in this article for matrices over $\mathbb{R}$, $\mathbb{C}$, and $\mathbb{Q}$.
