Artifacts

In Agile model documents are called as atrifacts.
Examples:-
Praposal document (from customer site in project or from management of company in product)
Product Backlog (PO)-ALL User stories
Sprint Backlog (PO)-Some user stories
High-Level Design & Low Level Designs (Developers in ST)

Unit test cases and integration test cases (Developers in ST)

Multi Scrum

1. Sometimes organizations can maintain multiple scrum teams for one project. When that project is huge. Here every scrum team is depending corresponding scrum master and product owner.
2. ALL SM and PO from scrum team can be coordinate chief scrum master and Mater PO.
   MPO Master Product owner
   CSM Chief Scrum Master

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Note: To get more information on agile scrum process, we are able to read SBOK guide.
SBOKSCRUM Body of knowledge.