Heptagon.
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A septagon
It's a heptagon
well if you take octagon (8 sides) , in 3d shapes octagon is probably called octagonal prism. and the sides are actually called faces. AND a 7 sided shape , a heptagon, is called heptagonal prism
A seven-sided object is called a heptagon.
pentagon (5 sides) hexagon (6 sides) heptagon ( 7 sides) octagon (8 sides) nonagon (9 sides) decagon (10 sides)