In the context of the Solar System, "tumblers" refer to small celestial bodies that have highly irregular shapes and are generally considered to be remnants from the early solar system. These objects can be found in asteroid belts, comets, and other regions populated by minor planets and small bodies.
The "List of unnumbered minor planets" refers to a catalog of minor planets (also known as asteroids) that have been detected and observed but have not yet been assigned a numerical designation by the International Astronomical Union (IAU). Minor planets typically receive a number once they are confirmed and their orbits are well-established.
A "lost minor planet" refers to an asteroid or similar small celestial body that was once observed and cataloged but has not been seen or located in recent years, making it difficult to determine its current orbit and position. This can happen due to a variety of reasons, including factors such as faint brightness, observational limitations, or changes in the minor planet's orbital path over time.