Great Sage is Rimuru Tempest's analytical skill in That Time I Got Reincarnated as a Slime, known in Japanese as Tensei Shitara Slime Datta Ken, where it speaks in a calm, system-like voice to report analysis, skills and dangers. As clips from the anime spread through anime edits and meme pages, the short notice sound became a shorthand for a smart system delivering an answer. Creators still use it because it instantly signals intelligence, calculation and a reveal, even for viewers who have never watched the full series.