If you wish to communicate information, I suggest you call it an 10000-gon. Although there is a prefix for 10000 I suggest you keep it simple. Not only is the use of long Greek prefices pretentious, you will only annoy the reader who will probably have to consult a dictionary. Having said that, if you do want to be pretentious or obfuscate, you can use the link below for polygons with up to 999 sides. http://faculty.kutztown.edu/schaeffe/Tutorials/General/Polygons.html
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A 10 sided shape is called a decagon
A decagon
A 10 sided shape is a decagon
a 10-sided and verticed polygon is called a decagon
A triangle only has 3 sides, but a 10 sided shape is called a decagon