In a collaboration diagram (collaboration diagram: An interaction diagram that shows, for one system event described by one use case, how a group of objects collaborate with one another.), a multi-object represents a set of object roles on the ''many'' end of an association role. A multi-object is used within a collaboration to show operations that address the entire set of objects as a unit rather than a single object in it. To indicate an operation on each object in the set, use a single message that includes an iteration and add a many indicator (*) to the target role name.
Name a Multi-Object shape and add other property values
Control which property values are displayed on the Multi-Object shape
Right-click the shape, click Shape Display Options, and then select or clear options to show or hide values.