A trapezoid, trapezium and a pentagon have only 1 set of parallel lines
Read more: What_3_shapes_have_1_set_of_parallel_lines
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Trapezium
It looks like a ladder with only one step, a railroad track with only one tie, or the upper-case letter ' H '.
A trapezium (has only one pair of unequal parallel lines).
If you mean one pair of parallel lines, then you're talking about a trapezoid.