Siren Head is a horror creature created by artist Trevor Henderson in 2018, and its imagery quickly spread through creepypasta pages, fan videos and gaming content. The sound most people search for is usually a fan-made or edited siren effect inspired by that character rather than one single official audio source. It remains popular because the concept is simple and instantly recognizable: a humanoid monster with sirens for a head, paired with a warning tone that makes any scene feel abandoned and unsafe.