The Zergling comes from StarCraft, Blizzard's real-time strategy game first released in 1998, where the Zerg are a swarming alien race and the Zergling is their fast, low-cost melee unit. Its screech became familiar to players through countless matches, campaign missions and later StarCraft II, and clips of it spread through gaming videos, streams and soundboards as shorthand for a Zerg rush. Decades later it still works because the sound is instantly tied to that rush tactic, even for viewers who have never played the game.