Trapezium

The word trapezium, used to describe a geometric shape, has two contradictory meanings:

(outside the US and Canada) – a quadrilateral with one pair of parallel sides, known in the US as a trapezoid.
(in the US and Canada) – a quadrilateral with no parallel sides (a shape known elsewhere as a general irregular quadrilateral).

The word trapezium can also mean:

Trapezium (bone), a bone in the wrist
Trapezium (astronomy), a group of stars in the Orion Nebula
Trapezium (play), a play by Henry Rathvon

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