On a class diagram, a solid triangle next to an association name shows the direction in which the association is read.

Name: On a class diagram, a solid triangle next to an association name shows the direction in which the association is read.
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A solid triangle, also known as a navigability indicator, next to an association name indicates the direction in which the association can be read or navigated. It shows which class is responsible for knowing about the other class in the association.

On a Class Diagram, a Solid Triangle Next to an Association