Depends how they were arranged.
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No, the number 2 does not have line symmetry.
the line of symmetry would occur at x=0
A line that divides the letter so that the 2 halves are mirror images. Ex. The letter V ... A vertical line thru the bottom makes 2 parts that are mirror images, so that vertical line is the axis of symmetry. But.. A Capital E would not have a vertical axis of symmetry. Capital E would have a horizontal line splitting thru the middle line as its axis of symmetry.
An octagon is a 2-dimensional figure, not a line of symmetry. However, it has several lines of symmetry.
A line of symmetry, or axis of symmetry.