A shape's sides are called faces.
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A seven sided shape is called a heptagon or a septagon.......
A one sided shape (ignoring the poor grammar) is a line. Is that what you wanted?
A seven or 7 sided polygon shape is called a Heptagon(hep-ta-gone).
Any plane shape on the side of a polyhedron is called a face.
If each angle is 90 degrees the shape is called a square.