A quadrilateral perhaps
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If the lines are all in the same plane and they are all straight lines then it is a polygon. Otherwise it has no specific name.
It is a polygon that is a closed plane figure with 3 or more straight lines.
A polygon is a generic term describing a closed plane figure bounded by 3 or more straight line segments. It need not have any perpendicular lines.
polygon
A irregular is a closed plane figure formed by three or more line segments.