This sound is tied to the Codec communication system from the Metal Gear Solid games, where Snake receives instructions and conversations over a stylized radio interface. The brief alert became memorable because players heard it repeatedly during story calls and mission updates. Outside the games, it spread through meme edits, gaming compilations, and parody briefings because a single chirp can instantly imply espionage, secrecy, and incoming orders. It still shows up whenever creators want a recognizable stealth-game signal without needing a full line of dialogue.