SIGNALIS is an indie survival horror game by rose-engine, released in 2022. Its audio design became popular with players because of its stark, mechanical tones and oppressive atmosphere, and short cues like this three-tone clip started circulating in edits and reposts. The sound fits the game's retro technology aesthetic, so creators use it to signal warnings, discoveries, or abrupt scene changes. Even outside direct game content, it still shows up in horror and sci-fi videos because the tone is instantly tense and recognizable.