a three sided polygon? that's the best answer I've ever been able to find
Ummm....a triangle perhaps?!
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=Pyramid=
A 7 sided pyramid would be called a heptahedral or heptahedron.
A trio is one name of a group of three people. It's called a trio.
yguyuy
A mystical ancient object hehehe!jk...i googled it and i couldn't find anything sry!! :o(