Siren Head is a horror creature created by artist Trevor Henderson and became widely known online through fan art, short videos and indie horror game content in the late 2010s. Sounds inspired by the character usually mimic an air-raid or warning siren to match its iconic look. The format spread across meme pages, YouTube horror edits and TikTok style monster clips because the audio instantly signals looming danger. It is still used when creators want a recognizable internet horror tone without needing much setup.