Which letter has rotational symmetry?

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.  

no association

step-by-step explanation:

if you have eyes and you can use them efficiently you can see that it just looks like random dots like do a line of best fit and like they're so spread out it's such a weak association you might as well consider it nonexistent