The 'big ball' at Epcot in Orlando Florida, is a Geodesic sphere. The old dome-like playground equipment is based on the same structure as a geodesic dome. I've posted a couple of links about geodesic domes with some pictures.
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dome
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.