Siren Head is a tall, skeletal horror creature created by Canadian artist Trevor Henderson, first shared online in 2018 as part of his unsettling creature art. With sirens for a head and a body that towers over trees, it quickly became a fixture of internet horror through fan art, short videos, creepypasta stories and fan-made games. Its scream is now used far beyond horror fandom, as a shorthand for dread, danger and something enormous approaching unseen.