O and X
And H and I (Note "O" has many, actually an infinite number of, lines of symmetry)
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Five.H , I , O , X( ' O ' has 2 lines of symmetry and more besides and ' X ' has 4 )
I x o l
Lower case "o" and "x" both have two lines of symmetry. Upper case letters with two lines of symmetry are: "O," "X," "H" and "I."
Seven
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.