Trapezium
Appearance
![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/74/Trapezium-trapezoid-comparisons.png/220px-Trapezium-trapezoid-comparisons.png)
Trapezium, describing a geometric shape, has two contradictory meanings:
- Outside the US and Canada: a quadrilateral with at least one pair of parallel sides (known in the US as a trapezoid)
- In the US and Canada[citation needed]: a quadrilateral with no parallel sides (known elsewhere as a general irregular quadrilateral)
Trapezium can also mean:
- Trapezium (bone), a bone in the wrist
- Trapezium (astronomy), a group of stars in the Orion Nebula
- Trapezium (play), by Henry Rathvon