Trapezium, plural trapezia, may refer to:
- Trapezium, in British and other forms of English, a trapezoid, a quadrilateral that has exactly one pair of parallel sides
- Trapezium, in North American English, an irregular quadrilateral with no sides parallel
- Trapezium (bone), a bone in the hand
- Trapezium Cluster, a group of stars in the Orion Nebula
- Trapezia (genus), guard crabs
- Trapezium (novel), a Japanese novel by Kazumi Takayama
See also
- Trapezius, a muscle
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