It's quite acceptable to call it a 1000-agon but what's more important is knowing how to work out its properties.
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it is pooing 1000 times
Just calling it a "1000-sided shape" is fine. It is too much trouble to search for fancy name for figures with many sides.
a shape with ten sides
regular shape is a shape that has same sides irregular shape is a shape that has diffrent sides
Chiliagon has 1000 sides. (In geometry, a chiliagon is a polygon with 1000 sides. The measure of each angle in a regular chiliagon is 179.64°.)