an octahedron
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In two dimension it would be an a-gon. In three dimensions it would be a a-hedron.
The name of an 8-sided polygon is octagon
An 8-sided shape is an octagon, as the prefix oct means 8.
multiple sided shapes are called polygons, one with 7 sides is called an heptagon one with 8 sides is called an octagon
Octagpn