It all depends what types of shapes, but take for example a circle, it can have multiple lines of symmetry.
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You would call the group of shapes which has at least one line of symmetry symmetrical shapes. Stars, circles, and rectangles are considered symmetrical shapes.
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.
An isosceles triangle has only one line of symmetry
None. A line of symmetry, if it exists, is infinitely long and so a third of the line cannot exist as a separate entity.
There are 11 letters with only one line of symmetry.