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There could be many answers to this. If were thinking in terms of geometry:

a triangle has between 1 and 3 lines of symmetry a square will always have 4 lines of symmetry.

Irregular shapes might have a single line of symmetry. For instance, a building may have a single line of symmetry.

a line between two points may only have one line of symmetry. because it is only 2 dimensions, it is impossible for it to have more than one line of symmetry.

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TechMan

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Q: What has a single line of symmetry?
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