union
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The set of elements that are members of**** at least one of two or more sets.
In set theory, the union of a collection of sets is the set of all elements in the collection.
In SNOMED CT, the union of two or more _subsets _of concepts consists of all concepts that are members of at least one of those subsets.
The following expression constraint language defines the set of concepts in the union of subtypes of 7569003 | Finger| and subtypes of 76505004 | Thumb structure| . The "OR" instruction indicates a union between the sets defined by constraints on either side of that instruction.
<< 7569003 |Finger| OR << 76505004 |Thumb structure|
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