One
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Two lines of symmetry; one vertical and one horizontal
2 Four if the cross bar is in the middle-- two diagonals, vertical and horizontal axes.
only 1
It depends on the rotation of the square. If it is aligned to the X and Y axes, then there are two horizontal lines. If it is not aligned to the X and Y axes, there are no horizontal lines.
Three * * * * * Just one - horizontal. Don't know where the other two are meant to be.