A squashed open box?
Alternatively, a right-angle trapezium:
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It depends on how many sides the polygon has: An octogon has 8 lines of symmetry, a pentagon has 5......
A clock typically has 12 lines of symmetry, as it can be divided into 12 equal parts when considering each hour mark as a point of symmetry. Each hour mark can act as a line of symmetry when the clock is divided vertically or horizontally. Additionally, the clock's hands can also create lines of symmetry depending on their positions.
Three capital letters that have two lines of symmetry are "O", "H", and "I" since they can be reflected either horizontally or vertically and still look the same.
A line of symmetry can be thought of as the line where you could cut a shape (or a line or any object) and it would look the exact same on both sides. An example of a shape with exactly two lines of symmetry would be a rectangle. A square also has at least two lines of symmetry, but it actually has four total.
A plane shape with five sides of equal length, and five equal angles: each of 108 degrees.