It's called an unoeigth. In mathamatical terms it's when pi repeats itself or the single didgit number that comes after 9 in a base 9 system.
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Decagon. A decagon is the name of a ten sided shape.
A 10-sided shape is a decagon.
A Pentacontagon is a fifty sided shape ...
hundred sided shape is called a chlligon
A 70 sided shape is called a heptacontagon.