There are 15 letters (upper case) in English alphabet which are symmetrical. Those are
A,B,C,D,E,H,I,M,O,T,U,V,W, X, Y
Find how many of 15 exhibit point symmetry as well. Your answer should be a number.
If you try to find out, you will see that only H, I, O and X exhibit point symmetry. This is shown in the figure (red dots)