H,I,O,X,
As with the Roman alphabet, which you may be familiar with it (since you are using it to read this answer), different letters have different symmetries.
H, M, N Kind of U (because the line curves at the end) If it doesn't have to be all the way vertical... A, V, W, X, Y
H
Not many. Depending on how you write, the letters L, O, Q, and X can have diagonal lines of symmetry.
o x l I
Four. F, G, J, L
the letters are : E
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.
letter o and x
Vertical lines of symmetry: A, H, I, M, O, T, U, V, W, X, Y Horizontal lines of symmetry: B, C, D, E, H, I, K, O, X Other: O
H,I,O,X,
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.
H,I,O,X Note that if you draw "O" as a perfect circle, it will have infinitely many lines of symmetry.
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."