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Assuming thatdiangle = diagonalsemetry = symmetryoctigon = octagonthe answer is 0, 1, 2, 4 or 8.
A heptagon has 4 diagonal lines and 7 sides and it has 2 congruent diagonal lines and 2 congruent triangles
A regular octagon has four pairs of parallel lines.
A regular octagon has 8 lines of symmetry. See the Related Link below that includes a diagram of an octagon with the lines of symmetry drawn. A non-symmetrical octagon may have between 0-4 lines of symmetry.