Cornifer is the cheerful cartographer of Hollow Knight, the 2017 adventure game by Team Cherry, who can be found humming to himself in the tunnels beneath Hallownest while he draws his maps. Players hear his tune when they track him down by following the sound, then buy a map of the area from him. The humming became a fond shorthand for the game itself among fans, shared on soundboards and in edits because it captures Cornifer's friendly personality and the relief of finding guidance in a dark, sprawling world.