The multiplicity of a relationship between two classes defines the number of objects of one class in relation to the number of objects of another class. In UML, the multiplicity of zero to many is represented by an asterisk(*) symbol. A one to many relationship is represented by using the 1..* notation. The following table describes the common multiplicities:
| Multiplicity | Representation |
|---|---|
| Exactly one instance | 1 |
| Zero or more instances | 0..* or * |
| One or more instances | 1..* |
| No instances or one instance | 0..1 |
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