A regular pentagon or a 5-pointed star have rotational symmetry of order 5.
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No, it can only have 0, 1 or 5 lines of symmetry.
Yes, it does.
Yes, because if you take a clover and fold it it will fold evenly like paper.
The word "ANGEL" has 0 lines of symmetry. In order for a word to have a line of symmetry, it must be the same when folded along that line. When you try to fold the word "ANGEL" along any possible line, it will not match up perfectly on both sides, therefore it has no lines of symmetry.
At most 5, since all symmetry lines must pass by a vertex. It has 5 if and only if the pentagon is regular.