Panagglutination is a phenomenon observed in immunology where antibodies cause the clumping or aggregation of a wide range of cells or particles, rather than being specific to a particular antigen. This can occur due to the presence of polyclonal antibodies that recognize multiple epitopes or due to the broad reactivity of certain antibodies. It is often studied in the context of blood typing, autoimmune diseases, and certain infections, where it can indicate an immune response that is not finely tuned to specific targets.