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.
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
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
H, I, and O
Depending on the font, they are N, S and Z.
Capital h, i, o, t, x.
o x l I
M w h
H, I, O, X (I think that's all)
An equilateral triangle has exactly three lines of symmetry. It is the only shape that contains exactly three lines of symmetry.
A square has exactly four lines of symmetry.
A square has exactly four lines of symmetry.
A rectangle has exactly 2 lines of symmetry