The letter N of the English alphabet has no line of symmetry.

The letter $\mathrm{H}$ of the English alphabet has no line of symmetry.

The letter $\mathrm{O}$ of the English alphabet has infinite number of lines of symmetry.

A parallelogram has no line of symmetry.

The diameter of a circle is the line of symmetry of the circle.

A rectangle is symmetrical about its diagonal.

Order of rotation of $\mathrm{I}$ is $2$.

Angle of rotation of $\mathrm{T}$ is $180°$.

Order of rotation of circle is infinite.