2
It has 8 rotational symmetry.
Infinitely many.
An ellipse has rotational symmetry of order 2.
5
9 reflection
18
Two.
A regular hexagon has 6 rotational symmetries (rotational symmetry of order six) and 6 reflective symmetries (six lines of symmetry).
A seven-pointed star has seven rotational symmetries. This means it can be rotated in increments of ( \frac{360^\circ}{7} ) and still appear unchanged. Each of these rotations corresponds to one of the seven points of the star. Therefore, the total number of rotational symmetries is equal to the number of points.
A kite has only one line of rotational symmetry, as it is only the same if it is tilted once. (back to its normal position).
None, however the semicircle has one folding axis of symmetry perpendicular to the midpoint of the straight side
As with the Roman alphabet, which you may be familiar with it (since you are using it to read this answer), different letters have different symmetries.