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What does the /shin/ marker (like Petucha/Setuma) at the end of Torah books mean?

I've been reading about details of Torah sofrut, and after learning about the paragraph markers peh / פ (petucha) and samekh / ס (setuma), I noticed some similarly placed shin markers (mostly at the end of a sefer), but cannot find an answer in Google searches. What does it stand for? (Example: parsha VaYechi)