Architecting and designing : UML 2.5 : Model Elements : Part
  
Part
UML part is a property of structured classifier which is contained by the classifier using composition. It means that all parts are destroyed when the containing classifier instance is destroyed.
You may draw a UML Part on a UML Class diagram, UML Component diagram, or UML Composite Structure diagram. Its definition is that of Property.
This graphic is described in the surrounding text.
See also
Association Node
CollaborationUse
Component
ConnectorNode
Connector Node (Invisible)
Structured Classifiers
Classifiers
TemplateSignature
Comment
Connector Node
Constraints
Data Types
Dependency Nodes
InformationFlow Node
Instances
Ports
Property
Structured Classifiers
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Model Elements