A polygon must be a 2-dimensional object so it cannot have any thickness (such as a sheet of paper), not can it have any curvature. So a picture on your TV screen - but only if it is a flat screen - is likely to be one of the few true examples.
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A fjord is a real world example of a fjord! They exist in the real world.
equilateral triangle is an example of regular polygon
A regular polygon
A rectangle, for example.
2 is a real world prime number.