Siren Head was created by artist Trevor Henderson in 2018 as part of his internet horror artwork featuring giant cryptid-like creatures. The character spread fast through memes, fan videos, and horror game content, and creators began using siren-style audio to represent its presence. That association made the sound popular on short-form video platforms, especially for found-footage edits and parody sightings. It still works because the concept is simple: a distant public warning siren instantly signals danger, while the Siren Head name adds a recognizable online horror reference.