The term "bloop" is an onomatopoeic word used to describe a sound that resembles a short, sharp burst or click. It can also refer to something that makes such a noise, like a small explosion or a sudden, brief occurrence of something. In popular culture, the term has been associated with unexplained sounds detected by hydrophones in deep ocean waters, often referred to as "Bloop" signals due to their similarity to the onomatopoeic word. These sounds are thought to be possibly made by large marine animals such as whales or even giant squids, but their origins remain a mystery and have given rise to various theories and speculations.