A solid line without arrows between an actor and a use case in a use case diagram represents a one-way flow of communication from the actor to the use case.

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In a use case diagram, a solid line without arrows between an actor and a use case represents an association, indicating that the actor is involved with the use case, but it does not specify the direction of communication, as communication is considered to be bi-directional.

A Solid Line Without Arrows Between an Actor and a Use