In the US, a stop sign.
Some tables. Some pickle jars lids. Designer mirrors. Picture frames, planters, clocks, old schoolhouses, UFC fight enclosures
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Scrystals and the cells in a bees honeycomb nest
In geometry, the octagonal prism is the sixth in an infinite set of prisms, formed by square sides and two regular octagon caps. Pencils and kaleidoscopes are shaped like octagonal prisms.
An eight sided shape is called an octagon.
That would be the stop sign.
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