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.
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None.
Two.
It has 1 order of rotational symmetry.
None - it has rotational symmetry - not reflection symmetry.
4
None.
None.
None.
Two.
2
it has order two (180 degrees)
It has 1 order of rotational symmetry.
1
None - it has rotational symmetry - not reflection symmetry.
4
Order 2.
Only one.