H, I, O, X (I think that's all)
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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.
H, I, O, X. Of course, it may depend on the font.
H, I and X. O has infinitely many and so does have 2.
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."
H i s x z