axial symmetry
symmetry with respect to an axis, when a shape which does not change upon undergoing a rotation around its symmetry axis
en-US/ˈæksiəl ˈsɪmətɹi/
en-GB/ˈæksɪəl ˈsɪmətɹɪ/
symmetry with respect to an axis, when a shape which does not change upon undergoing a rotation around its symmetry axis