Team Fortress 2 is Valve's class-based multiplayer shooter first released in 2007, and the Dispenser is one of the Engineer's signature buildable structures. In game it restores health, provides ammunition and generates metal for teammates nearby, while Engineers strike their buildings with the Wrench to build, repair and upgrade them. Clips of its idle loop have circulated on soundboards because the hum is instantly identifiable to players, even without visuals. The combination preserves a small piece of everyday TF2 base life rather than a dramatic kill or capture moment.