Sorry, but to answer this question you need to show us a picture of where the letter 'o' is marked. I'm probably wrong.
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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."
letter o and x
There are no lines of symmetry in the letter F
The letter R has no lines of symmetry