If it's a flat figure (2 dimensional), it's a heptagon.
If it's a solid object (3 dimensional), it's a heptahedron.
Hepta is the Greek for seven
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A seven-sided polygon is called a heptagon.
The name of a 7 sided polygon is Heptagon.
Heptagon - a seven sided two demensional figure
octagon
Decagon.