The term "UFO," or unidentified flying object, has become a widely used term to describe objects or phenomena seen in the sky that cannot be easily explained. However, there are several other terms that are sometimes used as synonyms for UFO. For example, the term "flying saucer" was popularized during the 1950s and 1960s to describe objects that were believed to be extraterrestrial spacecraft. "Alien craft" and "mystery aircraft" are also commonly used to describe UFOs. Additionally, terms such as "anomalous aerial phenomena" and "unidentified aerial phenomena" are sometimes used to describe UFOs, particularly in the scientific and military communities. Regardless of the term used, the mystery surrounding UFOs continues to captivate people around the world.