I x o l
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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.
o x l I
H, I and X. O has infinitely many and so does have 2.
Five.H , I , O , X( ' O ' has 2 lines of symmetry and more besides and ' X ' has 4 )
O and X And H and I (Note "O" has many, actually an infinite number of, lines of symmetry)