If "appears to have" allows actually has, then a trapezium or trapezoid.
If "appears to have" means does not actually have but only looks as if it does then a figure with non-parallel sides, shown from some particualr perspective.
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Squares always have two pairs of opposite sides that are parallel. A square cannot have just one pair of parallel sides. A quadrilateral (four-sided figure) with exactly one pair of parallel lines is a trapezoid.
A trapezoid has exactly one pair of parallel sides
They have two pairs of sides that are parallel. Trapeziums have exactly one pair of sides that are parallel.
A trapezoid has exactly one pair of opposite parallel sides of different lengths
A triangle cannot have two parallel sides. In order for a figure to be a triangle, it must be a closed figure with three sides and three angles. If two of the sides were parallel, there is no way the figure could be closed by only one other line.