11.2. The UML Association Notation
An association is represented as a line between classes with an association name. The association is inherently bidirectional, meaning that from instances of either class, logical traversal to the other is possible.
This traversal is purely abstract; it is not a statement about connections between software entities.
The ends of an association may contain a multiplicity expression indicating the numerical relationship between instances of the classes.
An optional “reading direction arrow” indicates the direction to read the association name; it does not indicate direction of visibility or navigation.
If not present, it is conventional to read the association from left to right or top to bottom, although the UML ...
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