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It is a line of symmetry
You can flip the traced version along various lines. If the flipped shape matches the original then the that is a line of symmetry. Alternatively, if you can find a fold such that the two halves of the tracing match then the fold line is a line of symmetry.
reflection
A closed geometric figure with four sides, each side being a straight line
A symetry line is like a mirror line, if you put it in the middle of something, the other side will have to be the same thing, flipped. if you take the letter V, you can put a vertical symetry line in the middle of it, and both sides will be exactally the same, but just flipped.