Troy is thinking of a shape. He says that it has four sides and that no sides have equal length. He also says that no sides are parallel. What is the best name for his shape?

Irregular quadrilateral

http://www.mathsteacher.com.au/year7/ch09_polygons/04_quad/quad.htm

Based on the given information, Troy's shape has four sides with no equal lengths and no parallel sides. This description matches that of a quadrilateral called a "Trapezoid." A trapezoid is a four-sided polygon in which only one pair of opposite sides are parallel. The other two sides can have different lengths and different angles.