Silent Hill is a survival horror video game series created by Konami, first released in 1999, in which the siren marks the town's shift from its foggy, everyday appearance to its darker, rusted Otherworld. The sound became closely linked to that transformation in gameplay footage, walkthroughs and horror compilations, and later spread through short-form video, where it was used as a danger alarm, signalling dread or a sudden change of tone. Because the siren is instantly recognisable even without gameplay, it remains a popular shorthand for horror, suspense and unsettling reveals.