A line (2D), ray (2D), vector (2D), line segment (2D), a mobius strip (3D), or a klein bottle (3D).
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A 3-sided figure is called a triangle.
A fourteen sided figure is either a "tetradecagon" or a "tetrakaidecagon".
A six-sided plane figure is called a hexagon.
The name of a four sided figure (or shape) is called a Square. :)
Heptagon - a seven sided two demensional figure