A figure in space is said to have axis symmetry if it can be mapped onto itself after a rotation that is strictly between $0^{\circ }$ and $360^{\circ }$ about a line. As the example above shows, a hexagonal prism can be rotated $60^{\circ },$ $120^{\circ },$ $180^{\circ },$ $240{,}^{\circ }$ or $300^{\circ }$ about the axis of symmetry $\ell$ and it would still look the same. It is worth noting that rotating any figure $360^{\circ }$ about any axis will not modify how it looks.