Trapezium

The term trapezium can mean more than one thing:

In human anatomy, trapezium is a bone in the hand
In geometry, a trapezium is also a name for a class of quadrilaterals. The precise definition differs between American English and British English, as described in that article; see also trapezoid.
In astronomy, a grouping of four young stars (an open cluster) and the associated gas in the Orion Nebula. [1]
In theatre, a play by Henry Rathvon

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Trapezium

See also: Trapezium, Astronomy, Geometry, Henry Rathvon, Human anatomy, Open cluster, Orion Nebula, Play, Quadrilateral