No, but it looks like it.
Actually the leter S does have a line of symmetry. Not vertically but horizontally. See, S.
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It has one line of vertical symmetry
The letter F does not have line symmetry.
The letter A has one vertical line of symmetry
A letter C has 1 line of symmetry. A line of symmetry is a line that divides a shape into two equal halves that are mirror images of each other. In the case of the letter C, a vertical line passing through the center of the letter would be the line of symmetry.
It is C that has a horizontal line of symmetry