This sound is associated with Hearts of Iron IV, a Paradox grand strategy game released in 2016 and widely abbreviated as HOI4. Online, players began using recognizable interface and event audio from the game in meme edits about war, diplomacy, and exaggerated victories. The peace deal cue stuck because it instantly communicates that the fight is over and the winner now decides the outcome. It remains popular in strategy circles, map memes, and crossover edits where a “negotiation” punchline fits better than a dramatic explosion sound.