The Queen Mary 2 is a Cunard ocean liner that entered service in 2004 and became known as one of the largest and most recognizable passenger ships in the world. Its horn is designed to be heard over long distances at sea, which gives recordings of it that unmistakable low, powerful character. Short clips of the blast have circulated on soundboards and in video edits, where creators use it as a shorthand for scale, departure and ceremony. It remains popular because a single blast instantly suggests a vast ship and a moment worth noticing.