None of them. W and U have 1, O has infinitely many.
Unless the O is elongated: an oval rather than a circle in which case is does have 2.
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Three capital letters that have two lines of symmetry are "O", "H", and "I" since they can be reflected either horizontally or vertically and still look the same.
I x o l
Capital h, i, o, t, x.
o x l I
M w h