Klingon cloaking technology is a long-running element of Star Trek, where Klingon Empire warships use it to approach unseen and strike without warning. The short electronic sweep associated with the effect became a recognisable shorthand in fan edits, games and parodies, because viewers understand the meaning even without seeing a ship. Clips labelled with Trek Sounds and codes like KLNGCLK have circulated on soundboards for years, kept alive by science fiction fans who reuse the sound for reveals, disappearances and stealth jokes far beyond the original series and films.