Which letter has rotational symmetry?

Answer:
S
Step-by-step explanation:
As we know that: A shape has Rotational Symmetry when it still looks the same after some rotation (of less than one full turn).
• Letter U has a reflection symmetry about a vertical line at the center
• Letter D has reflection symmetry about horizontal mirror at the center
• Letter L has no symmetry
• Only letter S has Rotational Symmetry
So please have a look at the attached for your better understanding.