Architecting and designing : UML 2.0 Lite : UML models : UML class diagrams : Object
  
Object
The object is an instance of a class. The object is drawn as a simple rectangle, with the name of the object and the class it instantiates listed within the rectangle.
Attributes may be added to an object's definition via the Attribute list box.
A simple object may be changed into a Multiple Object by selecting Multiple in the object's definition.
See also
UML class diagrams