If you wish to communicate information, I suggest you call it an 71-gon. Although there is a prefix for 71 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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it is called a seven sided shape in Canada
An five sided shape is called a Pentagon
A 90 sided shape is called Enneacontagon.
A 128-sided shape is called a hecatoicosioctagon.
it is called a henagon is a one sided shape