KBO, or Kuiper Belt Object, refers to any object that orbits the sun in the Kuiper Belt, which is a region of our solar system that lies beyond the orbit of Neptune. There are several synonyms for KBO, including trans-Neptunian object, minor planet, and plutino. These terms describe various types of objects that exist in the Kuiper Belt, such as dwarf planets like Pluto, icy bodies like Eris, and small asteroids. Many KBOs have intriguing and unique features that make them fascinating subjects for scientific study, and continued research into these objects may provide important insights into the history and evolution of our solar system.