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.
- In astronomy, a grouping of four young stars (an open cluster) and the associated gas in the Orion Nebula. [1]