The light coming out of your computer screen, that
makes it possible for your eyes to read this answer.
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The sun gives off radiation. An x-ray machine gives off radiation.
A fjord is a real world example of a fjord! They exist in the real world.
2 is a real world prime number.
a example of a hendecagon is a hedecagon
A real world example of what? Math in general? Geometry nets? Name the math concept and it'll be easier for readers to give you a real world example.