capital
Mississippi
E s i o
ALL letters have at least one line of rotational symmetry. However - if you mean reflective symmetry, the letters F, G, J, L, P, Q, R, S, & Z do not.
A capital N has no lines of symmetry (nor semetry).
No. An object/image has symmetry if you can draw a straight line through it and both sides are symmetrical (where the image looks the same on both sides of the line of symmetry.) There is no angle that you can place a line on the capital letter 'L' and get symmetrical images.
Yes, the capital letter N has rotational symmetry but no lines of symmetry:
S
H,i,o,x
No, but the spokes on a bicycle do.
Mississippi
None.
None.
1
None.
Two.
2
In the good old days (when I was at school and was taught about rotational symmetry) it had one, but the modern definition is to say it has none.