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UML Elements | Behavioral Diagram Elements | Decision
See UML Superstructure Specification, v2.1.1, figure 12.77, p. 363.
Used as a merge:
See UML Superstructure Specification, v2.1.1, figure 12.106, p. 388.
Note:
Moving a diagram generally does not affect the location of elements in packages. If you move a diagram out
of one package into another, all the elements in the diagram remain in the original package. However,
Decision elements are used only within one diagram, have no meaning outside that diagram, and are never
re-used in any other diagram. Therefore, if you move a diagram containing these elements, they are moved
to the new parent package with the diagram.
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OMG UML Specification
The OMG UML specification (UML Superstructure Specification, v2.1.1, p. 361 (Decision symbol)) states:
A decision node is a control node that chooses between outgoing flows. A decision node has one incoming
edge and multiple outgoing activity edges.
The OMG UML specification (UML Superstructure Specification, v2.1.1, p. 387 (Merge symbol)) also states:
A merge node is a control node that brings together multiple alternate flows. It is not used to synchronize
concurrent flows but to accept one among several alternate flows... A merge node has multiple incoming
edges and a single outgoing edge.
UML Dictionary