If you are talking about a perfect circle, it has wan infinite number if lines of symmetry. If you are talking about and actual lower case o, then the answer is two.
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O and X And H and I (Note "O" has many, actually an infinite number of, lines of symmetry)
Five.H , I , O , X( ' O ' has 2 lines of symmetry and more besides and ' X ' has 4 )
four
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."
A nephroid has 2 lines of symmetry.