Rainbow Six Siege, developed by Ubisoft and released in 2015, is a tactical first-person shooter built around destructible environments and gadget-based operators. The C4 is a remote explosive used to destroy walls, hatches and attackers, and its distinctive beep and blast have become instantly recognisable to the game's large online community. Clips of the sound spread through gameplay montages, streams and meme edits on video platforms, where it is reused as shorthand for a sudden, costly mistake or a perfectly timed trap. Its short length and clear warning-to-blast arc keep it useful for fast-paced edits.