Five.
H , I , O , X
( ' O ' has 2 lines of symmetry and more besides and ' X ' has 4 )
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O and X And H and I (Note "O" has many, actually an infinite number of, lines of symmetry)
Seven
It has 2 lines of symmetry.
A nephroid has 2 lines of symmetry.
a parallelogram has 2 lines of symmetry