This alarm is associated with Escape from Tarkov, the hardcore extraction shooter by Battlestate Games. Players recognize it from the Reserve map, where the siren became memorable because it signals pressure and changes the feel of a raid. Over time, Tarkov clips, montages and reaction edits spread the sound beyond the game itself. It still gets used because the tone is instantly readable even without context: once it starts, viewers expect danger, urgency and a scramble to react.