Oh, dude, a 105 sided polygon is called a "hectacontapentacontagon." Yeah, I know, it sounds like a made-up word, but apparently, that's what math wizards came up with. So, next time you're counting sides on a shape and hit 105, just drop that fancy term and watch everyone's jaws drop.
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The formal name is hectapentagon. Most people, including mathematicians, will use 105-gon since that effectively communicates the size of the polygon. But, if you want to appear pretentious or be obfuscatory, by all means use the Greek prefices.
Oh honey, that's called a "hectagon." It's like a regular polygon, but with a whole lot more sides to keep track of. Good luck trying to draw that bad boy without a protractor!
A five sided polygon is called a pentagon because pentagon means five sided polygon I think.
A 12-sided polygon is called a dodecagon.
A million-sided polygon is called a megagon.
A 20-sided polygon is called an icosagon.
A 90-sided polygon is called an enneacontagon.