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BPM Glossary:
A secondary actor is a person, business processes, or applications that provides a specific result or information to a use case in order for the end goal of the use case to be achieved. A secondary actor never initiates the use case. It is invoked by the system’s use cases in order to obtain the required information or result. There may be many secondary actors for a given system.

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https://www.modernanalyst.com/Careers/InterviewQuestions/tabid/128/ID/927/What-is-the-difference-between-a-Primary-and-Secondary-Actor-in-Use-Case-Modeling.aspx